I checked hotwire and priceline and didn't find anything suitable. A few miles away is OK as long as it's on a bus route that goes to the convention center. I've done that a couple of times but the place I stayed and bussed to the CC no longer exists. I usually have a rental car when I'm there, but parking is such a hassle that I either want to be able to walk or take a bus.
I'm trying a web site now called TripBAM (dot com) which shops for hotel rates and reports when they've found a lower one, but it's not turning up any rates better than what I've found on line directly from the hotel sites. I think scullyfan is on the right track - that rates will probably get more sensible in a couple more months, then get nonsensical right around show time.
By the way, for rental cars, I'm using AutoSlash.com now which really works well. Make a reservation for a car rental (any company), tell them your reservation number, and they keep shopping for a better price on that rental. For my trip to NAB next week, a two day rental from Thrifty in Las Vegas went from about $140 (totally outrageous) to $43 after about 5 price drops and a discount that they found. All for no cost to me (other than the rental when I pick it up).