USB ASIC Miners

[lite_]

Are they worth buying ?
If so, wheres the best/cheapest place to buy them ?

[Welsh]

Not worth purchasing any if you are looking for profit. If you want to get some just for educational reasons then I would say they are worth it. But, expecting to make a profit any time soon with them would be crazy now. The difficulty is far to high for these to have any effect.

[lite_]

Ok. Thanks.
Ill just buy 1 and play around with. 

[bryant.coleman]

At current hash levels, you will not get even BTC 0.0001 even if you run the device 24x7. So my advice would be to go for a better device, having lots of hash power.