You live in the world's richest country... And you have money for like 20 loaves of bread... This makes me feel strange... very strange...http://cgi.ebay.com/Roland-CM-32L-LA-sound-module-with-manual-PSU_W0QQitemZ7388007958QQcategoryZ58722QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
by the way - why it doesn't matter for you whether you buy one of these:
Roland SC-88 Pro
or one of these:
These two groups are completely different! So what do you need the card/module for? Maybe you don't need to buy anything. The first group is nicely emulated by software synthesizers: Roland Virtual Sound Canvas, Yamaha SoftSynthesizer S-YXG100plus.
The second group is also somehow emulated, but not in a very good way, but that is also something, for free