Also, save your wax, make your own foundation, buy cheap frames in large quantities, go to auctions and look out for kit in free ads, local rag etc.
I've been keeping bees for over twenty years now and started on a shoestring and have only ever reinvested honey sale's earnings to expand. Much of my early equipment was second (or third or fourth!) hand, given a thorough wash and a touch of repair here and there it was perfectly servicable and it's only now some of the ropeier stuff is being cycled out.
Floors, crown boards and roofs are all easily made at home, I was shocked to see roofs advertised at £40, does anybody pay that?