Didn't want to start a new thread on the same topic, though am aware this is an old thread.
Having heard good things about Megazorb, decided it was the stuff for me (or more precicely, my pigs!) Tried phoning around - but got poor response from the equine suppliers locally. Daftscotslass kindly gave me a bag of hers to try, and then the search was on to find some for myself!
This is the website I used to locate stockists:
Northern Crop Driers: Graze-On and Megazorb
Unfortunately the closest is a good 2 hour drive away! However, was near enough the Dalkeith shop over the holidays, and managed to squeeze a sack into my already packed Micra for the journey home! (it cost £5.35)
Back home, was in town, when passed horsey shop I hadn't been in before. Enquired within, and the kind shopkeeper ordered me two bags for £5.20 each! No hassles - no questions, can order me regularly as required (at what point shall I let on 'tis for my guinea pigs, not stables?!) Hoorah!
I have just completed a new hay/kitchen area, filled with megazorb - will let you know how it does (though I can't help feeling that with it being made for horses with their vast quantities of liquid excretion, it can only fair well with my four piggies pee-pees!)