http://www.lithiumion-batteries.com/EVGOLFCART.php
Distributor pricing with $50k order is about 50% from information received a couple years ago.
When extrapolate 36v battery pack to 72v pack. Drop in Gem pack with chargers and shipping to USA start at about about $4k msrp.
I have no connection with this company.
Found links in emails from last year.