rigid pvc tubing

Hi, I'm making a teepee and wendy house for my kids and I need to source rigid pvc poles/tubes for the frames.
I've spent about 20hrs trawling the net but all I've found are a couple of large companies who do extrusion and give no prices.
Does anyone out there know where I can get this product? Thanks.

it will be expensive, why not use garden canes?

Thanks, Yes I had thought of bamboo sticks and they would probably do for the teepee, but I don't think they would cope with the weight of material required for the wendy house.

I'm also looking at doing these for a few friends/family and therefore need to know the support structure will last longer than five mins. I have a sneaking suspicion that bamboo sticks wont hold up too well against boisterous kids!

So bearing this in mind I'm still hoping someone out there can help me find a source of rigid pvc tubing.