The most expensive piece of kit you'll need is the press/macerator. You can DIY one but most folks who make moderate volumes of cider will use a communal press. A colleague of mines uses one in the Dunbar area and it make life very easy.
You'll then need fermentation barrels/tubs then, and this isn't necessarily expensive, but then you'll need bottles! I got mines by being very nice to local pub landlords. Bulmers & Magners bottles lend themselves very well to re-use!