Perhaps you are looking for a latex cock and ball sheath, as you can see here: http://www.stockroom.com/b300.htm
These are available at most fetish stores, but are rather too thick to use as a condom in the usual sense, although I have known people to wear them for intercourse for fetish-related reasons, not as a prophalactic.
If you want even more coverage, you can obtain rubber briefs with a cock sheath in the front, as you see here: http://www.leatherpost.com/store/merchant....roduct_Count=26
For the ultimate in coverage, consider rubber shorts with a cock sheath, like these: http://www.erosboutique.org/store/merchant...=mens_underwear
Of course, these are all quite expensive, so they are not disposable after use, and would have to be washed. The rubber is fairly thick, so do not expect the sensation of a condom. Again, these items are designed for those who get off on the sensation of rubber, not for protective use in vanilla sex.