I've been looking too. I need 295/50/15's and 225/50/15's. You can find both pretty easily but there's not much available for the 15x10 inch rims that are what you would consider high performance/exotic car tread pattern.
I've been thinking about these for the back
If my math is correct the 26X12.00R15LT should work? I think these should almost be the same as
P295-50-15's...maybe with a slightly lower profile? Doesn't look like they have a 225/50/15 so I was thinking about these (tread pattern is kindof close) http://www.tirerack.com/tires/...lse&fromCompare1=yes.
You can find some different brands on ebay too http://www.ebay.com/sch/i.html...t=See-All-Categories but of course you can find these manufacturers other places as well.