Hi there i have an american PS2 and i live in the uk,and i will try and help you as much as possible.
I got my voltage converter from a company called another world,the voltage converter cost me 14.99,and 3 delivery for next day,here is there telephone number,
01782 271750,if you just explaine that you have an american ps2 and need a voltage converter they will help you out,they also sell import game as well,just incase you need any where to get them now.
Also here is there website
http://www.anotherworld.co.uk , but the voltage converter isnt on there,or at least i didnt find it on there,you just have to phone them.
Hope this helps you out,if you need any more help give me a shout.