See Winning Hotel bids in Top Cities from $28 per night!
My quick numbers for 3 star hotels are $45 weekday, $55 weekend, $60 busy weekend. Priceline has been publishing recent wins on their websites. It is actually a good number to work with. Try to bid using those number minus $5 on the win below $50, and minus $10 on the wins up to $100 to get the best deal.
