Second the no need for a belt comment. If you can't find one you like, keep looking and don't settle.

Most of the vendors on this site have inexpensive sporrans that will will great at less than $150. I would also look for a nice leather sporran strap (mojo leather already suggested--i got mine from there and love it).

In fact, my favorite sporran and strap together were less than $150 and both are well crafted and look great. .Of course, my style is subtle (well...as subtle as one can be in a kilt) so I tend to go for basic designs, nothing flashy or flamboyant.