The competitive cyclist demo program is a bit pricy. I looked into it and it was $75 for the 10 day demo (honestly not sure if they apply any of that towards a saddle purchase or not). But looking at your price range, paying for a demo where the cheapest saddle is about 200 bucks is likely beyond that budget.

Check out the saddles at Neuvation. They are budget priced (~50-80 bucks) copies of high end saddles and they have a no questions asked (X amount of days, though) return policy. So you may be out some shipping money, but you would be able to try a few things out before you decided on one.