For the ones we purchase most come from Stark. We also start our own and we buy clearance trees from Lowes, Walmart and TSC, when they cut the price by about 75%. We've had fairly good results with those too, but they often need to be planted immediately because both it's getting late and they've not had the best care at the store.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.