Depco pump company has seals and OEM and aftermarket pumps.
A great tip I learned was buy the inexpensive seal, but instead of the usual disassembly involving pressing out the shaft etc....just take out the impeller and carefully use a pick to pull out the bad seal. Just slide the new one on, replace the impeller and you may be good to go.
If that doesn't work, send to Depco for rebuild or buy a kit if you are handy enough. They also used to have less expensive aftermarket pumps.