There was an AP (Authentic Props) kit for sale in the junkyard a few days ago, not sure if it sold or not, if your looking for the best accurate/troopable kit then that is where you wanna go, if accuracy isn't really a big concern then you could get an FX kit, they come up for sale all the time, best tip is keep an eye on the junkyard and ask lots of questions as some kits may be pre-assembled and what fits one person may not fit another, good luck in your search!!
EDIT: The AP kit is sold but there is a TM sandtrooper up for sale as well as a VERY nice TE abs suit, check it out!!!