What do you base this on? They're selling for 0.07BTC/ea and they actually exist, I could order some today and they'll be here tomorrow. At this price you can still make ROI and then some.
The most profitable coin changes regularly so its hard to say what the most profitable one is. I've been using the hub for my BE's the OP linked to, however you'll need to make some modifications such as mentioned here:
https://bitcointalksearch.org/topic/m.3300729
I've also removed the DC input jack and soldered cables directly onto the hub which I plug into the molex adapters on my PSU. You'll need to do this otherwise you'll end up with something like this:
https://bitcointalksearch.org/topic/m.3168721
Where can you get BE's for only 0.07 each?
At least two that I have been following,
https://bitcointalksearch.org/topic/closed-group-buy-31-asicminer-cubes-035-btc-28-38ghs-307095
https://bitcointalksearch.org/topic/closed-batch-32-065-btc-per-blade-49-port-hubs-30-or-less-303640