Edit: I just read the specs, the weight limit of the bike below is too low. Bah! Still - I leave the post in case it's of interest. I hope you find what you need.
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Instead of a Pugsley how about a Walmart Mongoose Beast. $199 !
http://www.walmart.com/ip/26-Mongoos...-Bike/22861845
Here's a guy doing really well on one:
http://mtb-central.co.uk/news/news-f...-otter-classic
Just sayin - props to you for taking up riding. Stick with it.