Home made tire balancer.
It's a little fiddly, but it works fairly well, it's super compact, and was 'free'. It took time and stuff that I had lying around, but no money was spent on it. 4 small ball bearings, 10-32 screws and nuts, and some angle iron. It's fairly easy to detect 1/4oz., below that it gets dodgy. Being that 1/4 is as precise as balancing usually gets, and I don't plan to do any 200MPH rides on this sub-100 MPH bike, I decided that it's good enough.
Interestingly, the rear had no weights and is only 1/4oz off with the new tire. The front had a 3/4 oz weight about 2" away from where it now needs between 1/2 and 3/4. I had marked the heavy spot of both wheels without the tires, but the shop cleaned off my marks.