You can pay with your credit card:
car insurance
medical insurance
most of other bills (cable, cell phone bill, etc.)
buy gift card to the grocery store you go to, you can pre-pay 2-3 months in advance
find a good deal on slickdeals.net and sell it on ebay, you might not make any money (it'll cost you about 15% to sell things on ebay) but be able to hit your spending limit (computers, camera, etc)
hope this helps