Canadian pipe is lighter, but is getting harder and harder to find here in the US. Some Ace Hardware stores still have the American pipe, and I have used it for both .25 and .40 size planes.

These suppliers are listed on www.spadtothebone.com as mail-order sources for Canadian pipe:
Dan Gipe: [email protected] Spad builder from Michigan will mail order Canadian Gutter pipe, cut to your requested lengths. E-mail for prices.

Ken Latem: [email protected] Spad builder from Canada will mail order Canadian Gutter pipe, cut to your requested lengths. E-mail for prices.

PVC Supply O-Rama: http://www.digisys.net/users/tylert/pvcorama.html Montana Spad, offering different PVC pipe shapes and sizes.

HTH,
D