Cell phone batteries for sale?

Recently i bought an extra battery for my Samsung SCH-a670, as the battery of my phone was almost drained up and the power back up didn't even lasted for even an hour, only while it was connected to the charger it worked otherwise it was of no use. I researched on internet about the places where i can find places so that I dont need to spend my money on buying a new battery to my phone, I just wanted to replace it. Cellphoneshop.net was the place where I found the the battery to my place phone at a much better cost so that i can replace it. I remember one of my friend who suggested me about Cellphoneshop.net who purchased a Motorola V260 under the school sale at $5.99 whose market price was around $39.99. Also you can try at Westsidecellular which also is a prime website for buying and selling of cellphone accessories. But Cellphoneshop.net is more convenient to use than westsidecellular because of the sections which are divided are really easy for one to reach the product of its choice.