I could have bought the kit for ã259 but I got the Cornys from THBC and the gas for really cheap, I've saved a load over a complete system. I need a regulator some connections, beer line and a tap to complete. All in I think for just over ã100.
It's all new to me but this forum is great for help so I'm sure I'll get there.
Get your point about picking up bits cheap, and yep if you can save some dosh then why not.
From scratch ã259 is a substantial outlay, though if you work out the cost of a reg, corny keg, lines, tap, connectors etc etc i bet its not really that far of, and the piece of mind that you've got everything you need to keg and pump your brew.
I'm in the process of building a beer fermenting fridge, having spent out on the bits and bobs and the fridge itself i'd probably bought one if someone was making and selling them, that said there's nothing like the feeling of building something yourself and it actually working ( hopefully) :?