I had a similar problem, I used push bike tyres, I spent a whole sunday morning cutting them out, and made my own hoofies that wrapped round the hoof that was already there (i posted a pic on here somewhere). But after a few jumps, and runs they were gone, didn't take long to destroy them.
And in terms of saving money, done the opposite as was back to square one, but £20 down.
I brought a pair of Jason's and they are doing alot better.
Davey