Try the "Superior hose" listed at this site.

http://www.bagpipecovers.com/hose.html

Or the piper's hose at this site:

http://www.college-of-piping.co.uk/a...Kilt_Hose.html

Cheapest prices I have found on the internet for the Lewis-style hose and piper's hose. REmember you have to figure the exchange rate of $1.50 per GBP and then shipping across the pond, but if you are buying more than one pair it will probably save you on the shipping.

I have several pairs of piper's hose and I swear I could probably put BOTH legs into one hose, they are so elastic, and extremely long to boot. The pipers hose are all 70%wool/30%nylon in all the colors except white, which are not wool but mostly acryllic (which is actually stretchier even than the wool, if you like white).