did you check DUG? There's DIG and then the ultra oil and gas, Symbol: DUG.
But I guess you're looking for USO, but ultra short. I don't think so because its a commodity fund. I could be wrong though, check the ETF section at amex.com
There's the eui, fxe, and xde. check the products specs though, because some might be inverse. some are indexes. i think only the fxe is an ETF. you can always trade puts or calls and get negative correlation., good luck.