well,
I was once on a project that required a HV source so we grabbed a couple laser printers from a local electronics recycler. I'd recommend that instead of ebay since I noticed the laser assemblies come in 3,5,6 sided types and some also have concave faces meant to focus the beamsweep at a fixed distance. they seem easy to interface with though - usually it's a 3 phase spindle motor with hall sensor feedback and you're set.
Anyhow, electronics disposal places are usually happy to help.