The following GTA titles are 80% off (reduced prices shown):
GTA III - $2.00
GTA: Vice City - $2.00
GTA: San Andreas - $3.00
GTA: IV Not Complete - $4.00
GTA: Episodes From Liberty City - $4.00
GTA: IV Complete Includes Episodes From Liberty City - $6.00
Some are available as Steam digital codes and a couple are available as PC downloads.
As these are digital purchases you will require a US billing address to purchase these codes.
I realise GTA V is just around the corner for PC but I picked up GTA: EFLC purely for the LCPD:FR mod.
"Your order is being processed. Please do not close this page or click the back button on your browser." why is this taking so long?