They're actually not all that difficult to make and seeds are readily available from several different sources. Of the two I have, I bought one at a rondyvoos and the other one was made for me by my best friend.
If it's instant gratification you seek then chek out Jas. Townsend & Sons. (Don't have the link - just google them.)
And yes, as B-man mentions, they're kinda' fragile, BUT I've have both of mine for many years and they've stood up to some pretty rough back country travel. Just don't set them down anywhere they'll get stepped on or kicked around. (Better not to do that with ANY of your gear.)
Luck to you!