URGENT::online games using own isp in the uk
 

I have managed to get the internet working no probs also i have now got chuchu rocket and ########Star online working but not q3 or planet ring yet.My question is where can i buy a 56k modem for the dreamcast from to use on my uk dreamcast and i know they wernt released in the uk they are out in the usa is there a site i can buy one from as PSO is laggy using own isp.