Is here any shop what buy Xbox360 games or where can change them to another games?

My games are PAL version but most of them work with every other version console too or NTSC/U version console.

What is suitable price selling used Xbox360 games in here?

There is a shop at Computer Plaza along the north side of the moat (the building next to the one with Fitness Thailand). They sell Xbox 360 consoles and pirated games. Not sure if they buy them, but it may be worth checking out. Their games cost 100 baht usually.

There is a shop just south of the railway station.

https://www.google.co.uk/maps?ll=18.777027,99.017909&spn=0.011885,0.021136&t=m&z=16&layer=c&cbll=18.77696,99.01797&panoid=_AtueY2Uy56ih0xm9iMbQw&cbp=12,19.1,,0,5.48

Problem with official (non-pirated) Xbox games is the region coding - not everyone has their boxes chipped. You might find it better selling the real games in the classified section here separately - most of the shops I see only tend to sell pirated versions (Airport Plaza - stall shop next to 4th floor food hall, opposite Thai book shop) - but that also required a chipped xbox. What region coding do your games have? What games are they?

Problem with official (non-pirated) Xbox games is the region coding - not everyone has their boxes chipped. You might find it better selling the real games in the classified section here separately - most of the shops I see only tend to sell pirated versions (Airport Plaza - stall shop next to 4th floor food hall, opposite Thai book shop) - but that also required a chipped xbox. What region coding do your games have? What games are they?

http://classifieds.thaivisa.com/electronics/software/xbox360-games-260816.html