I found here but the problem is that there are limits to countries but it is:
- GTA II
- Grand Theft Auto III,
- Grand Theft Auto: Vice City,
- Grand Theft Auto: San Andreas,
- Grand Theft Auto IV
- Grand Theft Auto: Episodes from Liberty City
Interesting, though it says out of stock... I wonder if you could actually get GTA 1/2 from there...
I'd really like to get GTA 2 on my Steam library. No idea why don't they sell it.
Poor compatibility with modern systems may be a reason as mentioned before... They could get bad reviews and many support requests.