You have a few options..It kinda depends on how long you have before the drop day..
A) Use drop catching software to try and catch the domain yourself once it drops. If it's a .COM/.NET domain then it will drop between 1PM-3PM CST on its drop date.
B) There are other places you can submit backorder requests aside from just NameJet/SnapNames..Places like DynaDot/Pheenix/BackorderZone/GoDaddy will all let you backorder a domain (some on a first come, first serve basis) and charge less then NJ/SN. The only thing is, these backorder services usually can't beat NJ/SN so if there is a bid on one of those two sites you probably won't get it anywhere.