chixride, don't give up on spin class. at one point I was teaching 14 spin classes a week (on those terrible saddles) and I didn't have discomfort.

fitting a spin bike is different than fitting your road bike. the saddle on a spin bike is firm and wide and meant to support your sit bones (not your soft tissue). many roadies think they should lower their bar to match their road geometry, but this isn't the case and can cause some severe saddle discomfort. spin bikes are designed to put the rider in a more upright riding position. try this and I bet you'll find the saddle isn't uncomfortable anymore.

some spinners find a gel saddle cover eases discomfort. some gyms have them available to use. if your gym doesn't, you can likely purchase one at your local bike shop.

if you're serious about spinning, check with the gym about ordering a spare seatpost on which you can install your own saddle. then you can just swap the seatpost in and out each time you participate in class.