My experience has been that $350-$400 is pretty much the avg. going rate for T5 in drop-in runnable shape = at least a few years ago when I was looking. As mentioned, you may not be dealing with trustworthy seller and overpaying for a core. I bought T5WC for 1,000 that came with bell, new clutch pressure plate, shifter, fork and a freshly built 302 with quality parts and ARP bolts along with all the drive accessories. This was all out of an '88 Mustang GT. Ended up selling the T5 and shifter for $400, heads for $250, E303 cam and roller lifters for $150, valve covers and air cleaner for $100, misc parts for $100 and was left with the fresh shortblock, bell and clutch/PP all for a net cost of $0 - not bad. Fella had just completed the build and then hydroplaned the mustang into a wall on his 2nd outing and was in need of cash at time and I was first to call. Was initially planning to run that T5 but decided to sell instead and trade-up to a T5Z for better gearing, durability and not have to worry about yanking it out anytime soon. That was when they were only $1,400 at Summit - noticed they've been going up rather quickly.