pardu,
I believe Jeff B made the original backpack; but to be honest; I think you can pick a cheap one up for about £80 and I think on the Shurflo website they're selling them for about £120; which is a lot less than the £240 I paid for one over three years ago.
I'd recommend a Shurlo back pack though; mine's had a right hammering and it's still going strong.
With regards to poles, if you're just setting up to go WFP, you can make a class DIY one for under £50 (that's including the brush head, good neck), and I think Emporium do a good lightweight modular 18 foot one for about £50 too.