Amazon has a big fake product problem. Make or source a knock off of anything that is relatively interchangeable, such as a replacement filter, then list it as being the real product.
Even when Amazon lists an alternative "by Generic" you can still list under the real item (e.g. "Dirt Devil F1 HEPA Filter by Dirt Devil" http://www.amazon.com/Dirt-Devil-F1-HEPA-Filter/dp/B00022NGI... ) review less than 20 hours ago says its fake. What do you think it costs to make a knock off filter? If you under price it, then consumers know for sure its a knock off, so you take the market price, in this case $8.50 - the 50 cents it took to make and ship across the ocean, and add Amazon's overpriced per item shipping for third party sellers to make another few dollars on top of it. This is happening to a lot of other products.
What are the risks? Manufacturers don't care. I've emailed complaints myself, without response. At worst you get kicked off Amazon.
I for one tend to buy Prime items only. No hassle and fast delivery.
Worse yet, when I worked at Amazon a fair whiles back FBA 3rd party merchants had their inventory mixed into the general Amazon pool, creating a hell of a inventory contamination problem. This was particularly egregious in products where just about everything sold by a third party was a knockoff (see: memory cards). You could buy directly from Amazon and receive knockoff goods by virtue of a third party contaminating the supply by storing their inventory at Amazon's warehouses.
I'm not sure if this has been fixed. I sure as hell hope so.
How cheap is that? I'm not even seeing Nashbar jerseys for those prices...so yeah, that's fishy.
Search for "macbook battery" and order by price, lowest to highest. You'll find a lot of counterfeits.
With that being said, I wonder what the seller's reputation rating was. Much like eBay, you can (and should) always check the seller's feedback before committing to a purchase.