I am going need some recommendations regarding looking a cheap BTC miner with the purpose to teach others about the process of mining. I don't really need one to profit from it (no matter if it has a very low hashrate) just want one for educational purposes and use it as a medium to promote Bitcoins too. Any ideas on what type of miner would be the one suitable for this task? The cheaper it is the better.
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The good cheap miners would be an antminer U3 or U2.
The U3 is at around 60GHs so not that big and is around $20-30
The U2 seems to be around 2GHs.
I think the U3 is also only a few hundred grams.
Potential: you could also get an antrouter R1 and smash it to view its components for educational purposes, as a miner it probably isn't good but is small.
EDIT: their price has increased so this may be better:
GekkoScience Compac 8-16 GH/s (23 GH/s max.)
Otherwise, if you want a standalone aio miner use an antminer s1 or s2