Welcome to Bike Forums.
At your price range and without the BD option, I would still say look at Craigslist. While postings on CL can certainly be overpriced (sometimes I take a stroll there just to laugh at the ridiculous ones), there are also others that are fairly (somewhat) valued. Furthermore there is usually room for negotiation. Might take some time/patience though.
What is important is that you know what you are getting for the $: component, condition, make, etc. If unsure you are always welcome to post in the appropriate forum and ask for second opinions. Good luck!