cekkk wrote:
Well, I tried to buy a receptacle at Lowe's, an RV dealer and a plumbing outlet that has a lot of electrical parts.  Nada.  A lot were close, but none were right, like the TT30 mentioned here.  I'm waiting to talk to Mark, my electrician, to see if he has one or if I should order online and hope it arrives in time.
I bought my TT-30R at Home Depot and the disconnect switch at an electrical wholesaler.  Fastest online place is probably Amazon - order today (Wed.) and they say it will arrive on Friday.  Your electrician should be able to get one from a wholesaler, but could take a while.