Everyone (including me) wants to know, "What is a good rank when scanning products to sell on Amazon?" Rather than go into a lengthy discussion about what rank is and how to effectively decipher good from bad, I am simply going to give you what I consider to be a good rank for fast turns on Amazon.
Health and Personal Care: 100,000
Health and Beauty: 20,000
Home and Kitchen: 10,000
In general I would say any category with a rank of 10,000 or less is a good rank (Except Baby, it fluctuates way too much!).
Here are some screen shots from some extremely fast sellers:
There are other factors to consider when deciding whether or not to buy, such as, Brand Name, Margin, Cost of Goods, Number of Sellers, Is Amazon Selling It, etc. If you have any specific questions please post them below I will do my best to answer them.