Unexplainablestore.com Gift Cards are available in $20, $30 and $50 denominations.
These Gift Cards can be used on all the items at Unexplainablestore.com, and never, ever expire.
Just add products to your shopping cart, and on Checkout page click on " I have a Gift Card " button...
Unexplainablestore.com Gift Card Terms and Conditions

Your Unexplainablestore.com Gift Card can be used repeatedly until the value of the card has been used. Your transaction amount should be less than your card balance or equal to the card balance. Note that your Unexplainablestore.com Gift Card may only be used to purchase products on http://www.unexplainablestore.com/

Also, the Unexplainablestore.com Gift Card cannot be used to purchase another Gift Card and cannot be exchanged for cash.