I'd try eBay or KEH. The main difference is the 203 has an average meter and the 205 has a 1% spot meter. I prefer the 205 because I prefer a spot meter, and with the spot you can do anything the average can do, but not vice-versa.
Is it worth the higher price? Well, to me it was. To some, perhaps not. It all depends on if you know how to use the spot to your advantage or not. Also, the 205 has a Zone mode that I find very very useful.
Look for a copy of the 205 brochure, or search the forum for info on the 205 vs the 203, as it's been described a number of times here already...as well as the differences between the 205FCC and 205TCC.
Best Regards,
Austin