I bought a 120 oceanic tech tank with starphire, a giesemann spectra light, 2 Vortech MP40s, deltec skimmer, calcium reactor and media reactor, teco chiller, sump, stand and rocks for $3000.00 This set up would have cost $7000 new.
Everything was 'like new' condition, only a few months old. So... internet searching and a little luck go a long way in this hobby.