Try
www.campus111.com and
www.pigpony.com. They just got a whole bunch of rockchip players (even Meizus, Ramoses, and Telecasts) and the prices are pretty damn good. I bought actions chipset players from them a few months ago and they arrived in decent time, so I would recommend them as honest sellers.
*edited to add: Also, if you purchase from campus111 and put the coupon code "campus111" in, you get either a 5% or 10% discount, I forget exactly which.