I am disturbed how many people want you to bunny hop it, myself included. I would try to order a seat-stay... if not ride it until it breaks. Depending on the suspension design the seat-stay takes a lot less force than the chain-stay.. though if your seat-stay is already cracked the frame may be of a design which stresses the seat-stay. Either way, i'm not sure how spectacular this failure will be, if you keep an eye on it you should be able to see it really breaking.

Don't spend another dime on it though.