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.
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