Check Craigslist. Check the local pawn shops. Call your local police station and find out how often they do auctions on the bikes that they have to pick up. etc......
You don't have to spend a lot on a first bike. There are finds everywhere. Tell friends what you are looking for and you would be amazed at what is sitting in the garages gathering dust.
GREAT WORK ON THE WEIGHT LOSS!!!!!!!
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2007 Jamis Ventura Comp
2006 Jamis Explorer 2.0
2000 Specialized Hardrock (bought used)
Swim, Bike, Run and sounds like fun