I was talking to a mate about avid bleeding as he runs their kit and i have some to fit.
His opinion is that the 10-11 quid kit on fleabay does the job as well as the Avid original.
The key is supposedly the little valve fittings and the plasticky ‘pipe clamps’ (that turn the bleed hose to/from the syringe into a one-way valve with manual intervention). The rest (ie, DOT 5.1, gloves, syringes and pipe) you could scare up really easily, but a small amount of brake fluid is worth buying.
It is worth noting that brake fluid is best bought in only the size bottle you plan to use right now. Apart from Shimano-style mineral (i think) and DOT 5.0 (*NOT* compatible with anything else, ever) brake fluid absorbs water from the air as soon as you open the container, so buying that £10 5l can cos it’ll last for ever is a poor move if you like your brakes without pressure locks from boiled water… For some reason brake fluid becomes wildly more expensive per amount the less you buy… the smallest bottle in Halfords’ is probably at least 4 quid before you start on the rest of the bits.