Rusty
Didnt spot that you intended to purchase a single seater. I would suggest trying to find a suitable, similar, two seater and do your Diff training on that then the move over to the similar type single seater will be an easy transition. If you are looking at a Jodel D9 single or similar doing the diff training in a Supercub is only half the job.
As for finding CRIs just visit any flying club and hold up a piece of paper with the following on:
CRI?
you will probably find two or three people come running towards you!.
Seriously there are quite a few of us around now and I see someone else has already volunteered. We exist to assist in just this way and ask the question here you are bound to find someone near you.
Ian