There are countless green websites on the internet today, ranging from tips about green parenting to business ideas for eco entrepreneurship. Most of these sites mention saving money while being green, but they tend to be more green (eco-friendly) focused and less green (money) focused. Luckily there are some green websites that you can count to consistently save you money.

Save When Shopping

Buy Green Items

Greenshopper is essentially an Amazon store that gives 10% of profits to environmental groups.

Ecobunga tells you about green giveaways and special deals.

Buy Used or Get Free Stuff

Craigslist is a site that everyone knows.  But it's still worth remembering that while most items in the for sale/wanted section of Craigslist cost money, they are discounted and usually used, thus reducing landfill waste.

Free Cycle is a worldwide network that allows you to get and give free stuff -- thereby reducing the amount of money you spend and reducing the amount of stuff going to landfills.

FreeSharing lists over 700 of local (often city based) free recycling groups that are similar to Free Cycle. 

Here are more sites like Free Cycle and FreeSharing organized by US, Canada, and UK. (For other countries it's best to look at FreeCycle.)

US

SharingIsGiving: US Listing: States A-N and States O to Z

Free Give Away

FreeUse

Canada

Reuses

 UK

2recycle

eFreeko

SnaffleUp

Don't Dump That

Save On Your House

Reduce Consumption and Waste Production

The Low Impact Living calculator shows you home improvements you can make that will save you money while lowering your environmental impact.  The end report tells you approximately how much the project will cost to do as well as how much you'll save -- allowing you to make the most cost effective decisions.

Reduce Electricity

Energy Star has a great website that will help you find appliances that will save energy, both reducing your impact on the earth while reducing the burden on your wallet.

The FTC also has good data on appliances. 

This U.S. Government run website allows you to conduct your own home energy audit.  

Repair Instead of Buying New

Fix it forums like the Bob Vila Fixit Site will show you how to do your own housing repairs.

eHow has good general advice for fixing just about anything.  Although for more specific advice you are better off visiting the links in the resources section at the bottom of the eHow articles. 

Save on Transportation

Driving

This vehicle eco calculator calculates the yearly cash savings along side by side with the yearly carbon emissions savings.

Ecomodder is one of the top websites for fuel economy and hypermiling tips.

Carpooling

eRideShare has daily carpools as well as carpools for special events and cross country trips.

Carpool World has a good list of local carpools groups.

Rideshare Directory lists a number of regional carpool websites.

Save on Travel

Search Green Travel allows you to search for travel using the Kayak search engine, receives a share of advertising revenue every time you search, then donates 50% of profits to environmental organizations.  (Full disclosure notice, this is a website I (the author of this post) co-founded.)

RezHub is a travel agency that donates 20% of their profits to environmental or volunteer nonprofits.

What other green websites do you use to save money?