MD should have the branch adapters in stock, I have more coming in if you wanted to order from someone else. They would be the only ones to have them right now. Check Lowes, they have some neat timers from Timex that I really like, the plug is in the center and they don't take up so much room and the digital ones and the ones with the pins I think can both do 15minutes. The unit from Corallife that is like a 6 strip with a timer on it might be perfect too, since every 15minutes you could switch from 1 to the other, the timer turns 2 sockets on when it turns two off, so it would be automated.