Meet the Do-It-Yourself Spacer
I love presentations that compare the effectiveness of expensive MDI spacers and the good old fashioned toilet paper roll. Not sure how well this company's do-it-yourself spacer performs, but the price is certainly attractive.
Using paper and a precise system of cuts and folds, we have designed a spacer that can be produced for approximately 25 cents, a cost reduction of more than 99%. Furthermore, the device can be distributed as a flat sheet to be folded into a usable form on-site, so hundreds can be sent for the cost of a stamp. (From http://www.changemakers.net/en-us/node/1389)
Read about paper spacers
-- Shawn Proctor