anyone know of a reasonable priced scanner that is capable of doing a relearn.

Define "reasonable"...

Which ones WILL do it? And roughly how much are they?

There are quite a few that can do it. I use an AutoEnginuity scan tool that is capable of a CASE learn.

I need to replace a crankshaft position sensor, and it then needs a relearn,i know decent ones with live data,run around $200 was just wondering how more i would need to spend.