You can balance them yourself if you own a pair of axle stands... Some people balance their wheels in situ, whether or not this is a good idea I don't know
Can you break a bike tyre's bead with a mallet? I've done that with car tyres, no idea if it works for bikes. (if not, you can build a press- all it needs to be is a big lever ultimately)
It's something I've thought about doing after speaking to FS, still not really decided if it's worth it though.