Beat Records have released a couple
Tequila / Era Sam Wallash... Lo chiamavano Cosi Sia!
Inginocchiati straniero... I cadaveri non fanno ombra! / Con lui cavalca la morte
Can be bought for around 12 euro each from www.beatrecords.it or www.intermezzomedia.it
These are the 'complete' soundtrack recordings. There are of course also some single tracks spread over a variety of compilations.
Check also this overview of what has been released of Coriolano Gori on CD and LP: