When merchants sell on their own sites, the price is usually less, mostly because they don't have to pay a cut of the price to the hosting store, because they are the hosting store. 

As for the $1 charge, it's a normal charge for a merchant bank to test the card to make sure it works and to make sure the information given by the purchaser matches the card (none of the private information is viewable by the business, only by their merchant bank, or the banking entity that gave them rights to use their banking system.  It will fall off within 7 days (it usually only takes 3).  )

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.