Tiger Direct charging almost 30% taxes, are they crazy?

Just placed an order for a PSU and had to cancel after realize they are charging so huge taxes. Have to wait 2 days to get my money back.

Items: Ultra HS Modular 750W ATX Power Supply In Stock
Qty. Price
1 $69.99

Items: $69.99
Shipping & Handling: $0.00
Sales Tax: $20.29
Order Total: $90.28

Outrageous.

the explanation from Tiger Direct is:

"What happened was that because of the unstability of BitCoin, by the time the order was finally processed, the value of your bitcoin strengthened.
Causing an overdrafting."

It took less than an hour for the transaction to get 7 confirmations in the blockchain, during that time the BTC value did not rise $15.39 or 0.03 BTC as they claim ( it was going up at that time 8:10pm $587.83 and 9:30pm $589.14, less than 2 dollars increase to be exact $1.31 per bitcoin).

When trying to cancel the order and get a refund in BTC, guess what?

NO BTC RETURN ONLY A GIFT CARD FOR $90.28

Obviously not a good way to do business.

I have copy of the order with the time and the chat transcript with Tiger Direct representative.

I better spend my bitcoins in the near Grill restaurant than buying from them again.