I bought a half-dozen of them last year, online, for $3-5 each delivered. They were overgrown in 4" pots. I got them on sale, in May and June, and potted them up to trade gallon containers. I planted them out in July. They reached full mature height before the end of the summer, and looked great throughout the fall.

I can't help you on the PFG...no experience. I'd say it's already too late to plant warm season grasses in your zone. There isn't enough time between now and when they go dormant to get established. I'd wait until the soil warms up in the spring, at least into the 60's.

I love puple grass.

There is an old thread on the GW United Kingdom forum on this subject where some people have tried overwintering it. They said it doesn't go dormant and it needs to be kept above 50 degrees in a window. It dies in the dark. Sounds less than easy to get one through winter unless you have a greenhouse or nice bright southern window. The OG Forum isn't as friendly or chatty like this forum, more of a cut and dry factual place but you can get good information from Donn who does know grasses and has good advice. Its been kind of dead over there lately. Really, I think just experiment the best you can, the answer is sort of obvious since its zone 9. You will definitely loose it in the ground so there is nothing to loose in trying.