According to the National Retail Federation, parents with children in grades K-12 will spend an average of $688.62 on back-to-school necessities this year. And for parents with students heading off to college, that number jumps even higher, to $907.22.

With numbers like these, opportunities to save money on school supplies are more important than ever. And to help you find the biggest savings on the items you need most, we've rounded up some of the best resources the web has to offer.

Basic Back-to-School Saving Tips

In order to save the most money, you're going to need a smart strategy. For helpful tips on back-to-school savings, check out the following articles:

Back-to-School Promotions = Big Savings

Retailers know that consumers are looking for savings, so back-to-school deals and promotions are in full swing right now — but you need to know where to look for them.

  • RetailMeNot has a Back-to-School 2012 promotion that includes discounts at many prominent back-to-school retailers. You'll find printable coupons, coupon codes for online shopping, and even an iPhone app for deals on the go.
  • The Master List for Back-to-School Shopping Cheat Sheets at Fat Wallet will help you identify which retailers offer student discounts, where to find deals on backpacks, and expert picks of the best laptop deals and discounts on the market.
  • OfficeMax and Old Navy have teamed up for a cross-promotional campaign that rewards customers who shop at one store with coupons for savings at the other.

By taking advantage of the tips and promotions listed above, you'll be able to send your kids back to school with the supplies they need (and enough cash left over to pay the mortgage). Just don't get too comfortable — the holiday shopping season is closer than you think!