I'll keep a look out and just gather them as they come along i think. Deejays link is great, so that will be a usefull sorce. I cant see any sign that somone makes repro's of them.
On a side note, when they are buggered (the core anywhay) i found smashing the middle out of the solid tire makes a good dog toy, our little one eat tennis balls and shop toys, yet she cant get through the tires on these. however, thats only for the rubbish ones.
