Just something I found on ebay.co.uk:
TOYOTA MR2 2.0i 16v CAT FRONT PIPE on eBay, also, Toyota, Car Parts, Cars, Parts Vehicles (end time 11-Mar-09 03:10:51 GMT)
Looks to be reasonably priced too. The shipping might be high, but the cost of everything should still be well under $200. Much better than trying to get an exhaust shop to make one.
The name of the place is yes4carparts.