I recently bought the same battery from an American based online shop for $84.75. I would imagine the price difference could be caused by a couple of things. One place is selling for a profit, while the other place is selling almost for cost.
Also, I've seen people who claim to be distributers sale products to the general public. Distributers would be able to sale the item for cheaper comparied to the retailer.
RC America - XRAY USA - Hudy
Alamo City Racing Club - San Antonio, TX