You can find 2.5G switches with a reasonable amount of ports on the cheap. For 10G though the cost is still prohibitive IMHO unless you are fine with 2 ports.
replyFor cables, I think everything converged to cat6a a while ago, which is both reasonably cheap and perfecrly fine for 10G (up to 100m from what I remember)
Mikrotik has a couple 4-5 port 10 GbE switches (one has SFP+ ports, one has RJ45), and Ubiquiti has a couple small switches now that don't quite break the bank at least.
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