I bought the Yamaha "thunder" YMF724 soundcard.
It's PCI and has an OPL3 on it (there are not many cards like this), meaning you can put it in a modern PC and don't need to buy an old one. IT'S GREAT!
you should also buy this soundcard
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Chicago IL
they've got them on amazon, but its like 2.5 times more than i paid for my opl3 laptop on ebay
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uhajdafdfdfa
oh 
i put in a bid (apparently the only bid) on a website called "ioffer" and got it for next-to-nothing
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Russia, Moscow
(Un)funny thing that these days there is a new problem with OPL. Earlier we had a lot of cheap ISA OPL cards and no modern motherboards with ISA slots. PCI is still there, but these days motherboards has like 1-2 PCI slots, and sometimes not all the slots could be used physically (because things like PCI-E videocards are huge), so it could be a problem to use PCI card.