What I have bought so far for my lab:
2 switches for less than $37.00
2 routers for less than $45.00
Everything else I'm bidding on, but waiting until last day bids to do get them.
1 router (which will finish my collection for the lab, until CCNP time) looking at less than $30.00
Still need one more switch, cables for everything (power, cat5, serial to serial for the routers), a network rack (going to be the most expensive part), a switched PDU, and mounting brackets.
The really neat part. Looking at pre-built kits on ebay, they want between 400 to 500 for them, I'm building mine piece by piece, including a rack, for less.