There's this place that sells older gen consoles and such and they really sell the games for insane prices. I really am not going to buy Zelda: Ocarina of Time for $60. 
I actually went in to buy a N64 with two controllers and some games but when I saw the prices of the games were more than the system ($40), I just bought 1 N64 usb controller and got an emulator with all the games I really wanted to play for free. Just ugh!
That's the problem with some stores. With my company, if I sold stuff, I would sell it reasonable prices, but usually people would just try to buy out whatever I had. Atleast I still make a decent profit and usually I don't hold onto stock.
I had a guy try to sell me the NEO GEO MVS home cart system for $500 (no games), I tried to tell the guy for that price I can not only build you an arcade supergun (or arcade cabinet) but have a legit 161 games on it.
The arcade MVS cart games list:
1  SNK VS CAPCOM +
2  SNK VS CAPCOM RMX
3  SVC SUPER PLUS
4  KOF 94
5  KOF 94 +
6  KOF 95
7  KOF 95 +
8  KOF 96
9  KOF 96 +
10  KOF 96 EVO
11  KOF 97
12  KOF 97 2003
13  KOF 97 REMIX
14  KOF 97 PLUS
15  KING OF GLADIATOR
16  KOG PLUS
17  KOF 98
18  KOF 98 +
19  KOF 98 ULTIMATE
20  KOF 98 OROCHI
21  KOF 99
22  KOF 99 +
23  KOF 99 CN
24  KOF 2001
25  KOF 2001 PLUS
26  C.T.H.D
27  C.T.H.D SUPER PLUS
28  KOF 2002
29  KOF 2002 MAGIC
30  KOF 2002 MAGIC 2
31  KOF 2002 CN
32  KOF 2002 OROCHI
33  KOF 2002 LUAN
34  KOF 2002 SUPER
35  KOF 2002 SUPER 2
36  KOF 2003
37  KOF 2004 SE PLUS
38  KOF 2004 SE
39  KOF 2004 SMP
40  KOF 10TH
41  KOF 05 UNIQUE
42  KOF 05 UNIQUE 2
43  KOF 10TH EXTRA +
44  RAGE OF DRAGONS
45  RAGE OF DRAGONS +
46  STRIKERS 1945 +
47  STRIKERS 1945 + +
48  AERO FIGHTERS 2
49  AERO FIGHTERS 3
50  METAL SLUG
51  METAL SLUG +
52  METAL SLUG 2
53  METAL SLUG 2 +
54  METAL SLUG 3
55  METAL SLUG 3 +
56  METAL SLUG 4
57  METAL SLUG 4 +
58  METAL SLUG X
59  METAL SLUG X +
60  METAL SLUG 6
61  METAL SLUG 6 +
62  SUPER SIDEKICKS 2
63  SUPER SIDEKICKS 3
64  ULTIMATE 11
65  NEO-GEO CUP 98
66  PLEASURE GOAL
67  SAMURAI SHODOWN
68  SAMURAI SHODOWN +
69  SAMURAI SHODOWN 2
70  SAMURAI SHODOWN 2+
71  SAMURAI SHODOWN 3
72  SAMURAI SHODOWN 3+
73  FIGHTERS SWORDS
74  SAMURAI SHODOWN 4
75  SAMURAI SHODOWN 4+
76  SAMURAI V SPECIAL
77  MATRIMELEE
78  MATRIMELEE +
79  SENGOKU
80  SENGOKU 3
81  SENGOKU 3 +
82  LAST BLADE
83  LAST BLADE +
84  THE LAST SOLDIER
85  LAST BLADE 2
86  LAST BLADE 2 +
87  LAST BLADE 2 EASY
88  MARK OF THE WOLVES
89  MARK OF WOLVES +
90  DOUBLE DRAGON
91  DOUBLE DRAGON +
92  NIGHTMARE
93  NIGHTMARE SP
94  SPIN MASTER
95  SPIN MASTER +
96  FAR EAST OF EDEN
97  LEGEND SUCCESS JOE
98  ART OF FIGHTING 2
99  ART OF FIGHTING 2+
100  KARNOV'S REVENGE
101  KARNOV'S REVENGE +
102  LANSQUENET 2004
103  SHOCK TROOPERS 2ND
104  PUZZLE BOBBLE
105  PUZZLE BOBBLE 2
106  PANIC BOMBER
107  STREET HOOP
108  NEO BOMBERMAN
109  ZUPAPA
110  BLAZING STAR
111  NINJA COMMANDO
112  OVER TOP
113  PULSTAR
114  TOP HUNTER
115  GANRYU
116  EIGHT MAN
117  MUTATION NATION
118  BASEBALL STARS 2
119  ALPHA MISSION 2
120  PRE ISLE 2
121  THRASH RALLY
122  ANDRO DUNOS
123  CAPTAIN TOMADAY
124  ZED BLADE
125  BANG BEAD
126  NEO DRIFT OUT
127  NEO TURF MASTERS
128  3 COUNT BOUT
129  BURNING FIGHT
130  LAST RESORT
131  NEO MR. DO!
132  ROBO ARMY
133  PUZZLE DE PON
134  MAGICAL DROP 2
135  FATAL FURY 1
136  MASTER OF SYOUGI
137  VIEWPOINT
138  WORLD HEROES 2
139  SOCCER BRAWL
140  BREAKERS
141  BREAKERS REVENGE
142  BATTLE FLIP SHOT
143  2020SUPER BASEBALL
144  WORLD HEROES
145  MONEY PUZZLE EXCH
146  KING OF MONSTERS
147  FOOTBALL FRENZY
148  BLUE'S JOURNEY
149  CROSSED SWORDS
150  STAKES WINNER
151   STAKES WINNER 2 (NEW!)
152   PUZZLE DE PON! R! (NEW!)
153   KOF 2003 CHANGE (NEW!)
154   SUPER DODGE BALL (NEW!)
155   MAGICAL DROP III (NEW!)
156   SAVAGE REIGN (NEW!)
157   KIZUNA ENCOUNTER (NEW!)
158   KOF 2002 ICE-BLUE (NEW!)
159   KOF 97 PJ (NEW!)
160   KOF 97 YL (NEW!)
161   KOG 97 CR  (NEW!)
Schzim, you want to play fighting games with that setup ? 
I suppose it's easy for you to get 74xx TTL chips, you could try this one:
 
I made that in 2009 for using SEGA Saturn pads (without destroying them) on my arcade Supergun converter. Japanese Saturn pads are the best thing ever created for Street Fighter2-ish fighting games because it has the 6 buttons lined up and the directions are a inverted design against that of what Nintendo and SONY use on their controllers.
Also it has two shoulder buttons and start. Perfect for arcade use.
The circuit is a simple state machine which scan the buttons on both controllers and store the result in a array of four 8 bit latches. It sweeps through the controllers multiplexers at a rate of 480 bits per second (120hzx4). Each controller make four bits (4 buttons visible) in each of the four states so it latches buttons in groups of four.
The only thing that was tricky to get hold of was the Saturn controller connectors (the one on the console). I had to take one from a dead Saturn.
For Neo Geo, you can set it in a way that is of your liking by simply swapping how the wires connect from this board to the jamma connector. Simple to remap.