I am aiming around £500 for an inital 2x camera setup, but building up to a 4-6 cam solution;
1x Turret Cam (Dahua 2MP starlight) = £120 ea (?)
1x doorbell cam (TBC) = £80 ea (?)
100m CAT6 cable = £100 (Will probably only need half that, but, you know...)
4TB HDD Drive = £100
Blue Iris...