There is a pair of osiris stands for sale in ny for $300...
I think the Pvc route would look janky, and might be a waste of $ and time. Building them to be flat, equal and aesthetically pleasing would be difficult.
I agree with what was said about the stands being sturdy, heavy and stable. Add in non resonant and level, with spikes top and bottom and you should be good.
If you dont want to spend much, b&w stands filled with sand are decent and only cost $130 ish.
If you're looking for a workout, Cinder blocks work well in determining how tall of a stand works best.
No offense to anyone with janky stands... I've used them before too :)