How does my $ 6 in the account get used for a new order? - does not show up as minus $ 6 on new order?
$5 Gig price + $1 for Processing Fee
This, in case I read your question right:
An order may only be paid from a single funding source. So, if the order you are placing is larger than the funds available in your shopping balance, you will be redirected to PayPal for a funding source, and the funds in your shopping balance will remain until you place an order that is equal or smaller than your balance.