After getting tired of paying $130 night for mediocre (at best) rooms on Harbor, we started doing Priceline and have now successfully used it for 4 DLR visits this year. We always do Name Your Own Price. Lots of tips on the better bidding site mentioned. We do not do less than 3.5 stars, and have always been in the Garden Grove area. 2 stays at Doubletree, and 1 each at the Courtyard and Anaheim Marriott Suites next door to Courtyard. The shuttles are very easy to use and were free at the first two places mentioned, and like $4 person/day at the Suites. The only shuttle issues we've had was catching the one right after fireworks, when everyone leaves.
Our usual strategy: Choose 3.5 stars in the Anaheim South area. Bid $56. (sometimes we get greedier, and bid lower, but only once did we get anything lower). If that doesn't work we rebid on that area plus add in Anaheim North (knowing there are no 3.5 stars in that area). You have to add an area or change star level to rebid within 24 hrs. Then we raise our bid 5 or $10. This usually yields something. If not, we will try the next day or add in the Fullerton area, which also has shuttles from the hotels there, but we've never ended up in that area. Never paid more than $75 on Priceline, but keep in mind, these nicer hotels have parking and wifi fees.