Hi Sbom, The kits I saw for sale were quite expensive,
so I bought a 1960s optical microscope from fleabay and put my own kit together for about £90.
That said, If you just want to buy a kit that will work straight away without any doubts, try speaking to
Brunel Microscopes. They offered to put a kit together for me similar to their fish and pigeon disease kits, but with a Mcmaster slide etc. Although I didn't buy from them in the end, they were very helpful, and I'm sure you'd get good service from them.
I totally recommend it to anybody who has a scientific ish mind, and is willing to take a long term view of the cost. I've found it really useful to be able to do my own FECs, and I'm starting to get more confident in the results too (for example, our lambs were suspiciously parasite free this year, so I nipped over the fence and stole some fresh poo from our neighbour's lambs and horses.... and they were absolutely riddled!
). I've also found it useful to be able to do a post worming or quarantine effectiveness check.
HTH!