You're looking in the wrong place then. Here's a couple of links I posted earlier:
biofuel :
https://westwaleswillows.co.uk/product/src-kit/ kit with 200 cuttings of fast growing hybrid plus sheets and pegs and manual for £230.
basketry selection:
https://westwaleswillows.co.uk/product/justine3/ £9.95 for a bundle of 5 different basketry willow types, 2 of each, so £1 each.
You can get others, if you buy cuttings (for willow) or bare root it's MUCH cheaper than pot-grown (which is what I suspect your £35 was)- but need to be ordering and planting at the right time of year.
[There's other willow rod suppliers, a big one in Yorkshire and another big on in Leicestershire, I linked the producer in Wales as it's closer and the bigger bundles are collection only].
Now is the time to order bare root plants/trees or willow cuttings- to be delivered between Nov and Feb-they are lifted/cut and planted dormant. Willow rods should again be planted in winter when dormant, the links above estimating delivery from 6 Jan onwards.
GC