Before I built a stand for myself (I've got that sort of metal machining hobby shop) I used the "built in truing stand" of simply right in the frame that they will live in. A zip tie around the seat stay or fork tube works as an easily adjustable and non marring indicator finger for runout.
Yes it's cheap and dirty. And it's nicer if you can tip the frame up and use it upside down or have a good work stand to hold the frame firmly during all of this. But it does work just fine.