When various charities call, usually my alumni associations, I ask them why they don't use GoodSearch. GoodSearch is a search engine which donates 50-percent of its revenue to the charities and schools designated by its users. You use GoodSearch exactly as you would any other search engine. Because it's powered by Yahoo!, you get proven search results. The money GoodSearch donates to your cause comes from its advertisers — the users and the organizations do not spend a dime! You can simplify the process by by downloading the GoodSearch/GoodShop toolbar or put a badge/widget on your blog (go to the amount raised for your charity button).
Another one I use is The Hunger Site. You click daily to give free food, free mammograms, free child health care, free books, protect endangered habitat, and help animal rescue shelters.You can even set up email alerts in case you forgot to click (give) that day.
I just found out about a new one called Click to Give. It looks to me to be a Hunger Site clone, but the ads below the "give button" are more relevant to frugal folks who like freebies!
I use a kit from Leeners that had an initial cost of $29.95. Compare that to the sodastream maker which has an initial cost of $79.95 (from Google shopping).
Extract costs are about the same.
I have to buy a packet of yeast every 6 months (50 cents), sodastream users must exchange empty carbonators for a refill ($29.99)
I use honey and/or organic brown sugar for my sweetner, sodastream uses SPLENDA. A Duke study finds Splenda to be potentially dangerous!