Unless you know what you're doing I seriously wouldn't recommend DIY. An Astra dish (which is probably what you want) is nice and easy. Anything else like Sirius/Eurosat you'll struggle to do it yourself. I spent a whole afternoon trying to pole up on Sirius, very frustrating, and I've done quite a few installs in my time.

You might also find most wholesale suppliers unwilling to deal with members of the public. If you're like Cris and can roll up in a van with your work clothes on they're more likely to let you buy stuff. I've bought stuff from Grax in Manchester when I go with a mate of mine who's a sat comms engineer, I've seen them turn away quite a few people because they're not installers, seriously great prices though. You could give it a try but don't turn up in a shirt and tie!