If your kids are anything like mine, they burn through clothes, toys and gear faster than you can say "spaghetti stains."  So it makes sense to look for gently used stuff as often as possible. The good news is that buying secondhand clothes and gear is not only good for your wallet, it's great for the planet, too. Here are some great sites for eco-shopping and swapping on the Web:

Auctions

These sites let you find gently used toys, clothes, bedding, books, furniture and anything else you might need for your family.

Ebay

Mommy Auctions

Gently Used

ShopGoodwill

Secondhand sales

These online classifieds let you buy gently used duds and other stuff directly from their owners, without the hassle of an auction.

Craigslist

Half.com

Free stuff

You know what they say ... one parent's junk is another parent's treasure. To prove that point, these sites offer listings for free stuff that's no longer useful to their owners, but might be just what you're looking for.

Freecycle

The Green Umbrella

Freesharing

Reuse It Network

Swapping

Got some extra stuff you'd like to trade rather than sell? Try one of these online swapping sites:

DigNSwap

Neighborrow

Better World Books

Paper Back Swap

SwapTree