After rebidding several times using the zones without 4* hotels, I finally got the hotel I wanted for $90 / night. A little higher than normal (probably because I'm staying on weekdays instead of just the weekend this time), but still a huge savings over their normal rates. As always, thanks to BetterBidding.com! This time, I even remembered to click through one of the Priceline links here before bidding! :)