Homemade bators rock. And you LEARN a LOT building them - about ventilation, thermostats, heat position and what features you like in a bator and hate in a bator.
I'm running my third homemade right now - Darthbator. Across the room is the LRC - little red corvette bator, made from an 8 bottle wine cooler. Number four.
I've had two bought bators - an LG which I got to work but hated (cramped, hated burning myself on the heat element, hated the lid falling off) and I have a "new" antique redwood leahy bator which I am refinishing - now that's awesome. LOL 700 eggs...
So I built a foam one, then one in a metal cooler, then Darthbator a small black mini-fridge bator and LRC. I'll build again, though I'm still fiddling with Darth and LRC. They both have very nice features. The wine-coolers and mini-fridges keep awesome stable temps.
I've learned a lot more fiddling with homemade's than I would have with an "easy" bought bator.
Alternative heat sources for homemades are reptile heat tape, heat mats, outdoor rope lights, some have used curling iron insides, 12v under cabinet puck lights - use a dimmer they can be hot for small applications.
I'm still using a water heater thermostat for both my homemades I've gotten them to work well for me.
This is the good stuff and you all have gotten very creative.
I've never made a turner - I still turn by hand.