Truing your wheels can be done on the bike's own axles with cheap spoke wrenches if you want to spend as little as possible. Secure it on the center stand, make sure your chosen wheel is in the air, secure the bike (and steering head if doing the front wheel) in that spot, and attach a zip tie to a part near the rim pointing close to it -- and you have a "truing stand". You have to pop off the drive chain for the rear but it's not like wheel balancing where you need lower friction than the wheel bearings provide. You just have to be able to spin the wheel by hand to see the runout.
I have a dial indicator but I didn't use it until after I had trued the new wheel entirely by eye using a similar method. Just with my eyes and patience and cheap spoke wrenches from VintageCB750, I got my newly-built wheel to within .6mm of axial runout and .9mm of lateral runout. Spec is 2mm for each dimension. It surprised me how easy it was.
Ebay's search alerts have helped me find stuff I wanted pretty fast after it got listed.