Can I split Payment for Nexus 7 Dock?

So i really want to order the dock as soon as my replacement N7 comes in hopefully tomorrow or early next week.

I have about $28 in my google Wallet. Is there a way to maybe only use $15 or $20 of this then use a credit card for the rest? Mainly because i'd like to keep some $ for apps in the future for when i get my Galaxy S4 in June.

EDIT: I called google support and they said that you can only choose one form of payment, so this thread can be removed. Thanks!