Bought a couple bulk boxes of cable (solid copper, not rubbish copper-clad aluminum cable that work-hardens and fails a year later), a giant sack of RJ45 connectors, and a cheapo set of cutters/strippers/crimpers.
2000 feet of cable -- ~$110
1000 connectors -- $23
tolerably reliable tools -- $25
Basically set for a few years. Prices in USD