Bikes on Ebay generally go for more than they're worth. There are exceptions, but generally, someone is always willing to pay more for something than you.

The best way to find something is searching thrift stores, garage sales and www.craigslist.org. The competition for bikes is much less through these outlets. Often, thrift stores and garage sales will net you what you are looking for for less than $50. Shipping is that much on Ebay.

It just takes a little time, but be patient.