Which ones are you talking about? I just bought an ASIC Eruptor (333mh) for 44 bucks on ebay.
Im wondering why they cost $44, it should be $5.
Do you mind if I ask the reason you bought it?
Fun or serious mining?
I plan on serious mining but not for BTC. The best coin that I've found to mine, financially speaking, is freicoin. This is based off of information from coinplorer.com and the hardware mining simulator they have available.
Why do you think FRC? I've thought about that coin myself as well.
So this is what I used to estimate it out. Coinplorer.com (https://coinplorer.com/Hardware/Simulate/52c41fd28cdc150ed0133b39) allows for hardware estimates with mining and shows overall gain for days mined, including your electricity cost, mining fees for pool, and cost of hardware so it shows truly how much money you make. Freicoin was the best I found for about 2 or 3 days but since the market has been somewhat stale overall, there is really no true way to tell.
I set myself up on multipool.us so it mines whatever everyone is mining at the time. So far it's not made anything for actual money but I've only had it since Sunday mining. Don't expect to see REAL money/results until 15-30 days in.
Because You will never make money with, so the loss will be minimal... 
