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i just look for laptop batt then narrow down to but it now, then organize lowest price. here is a new 6 cell 5200mah for dell e6500 for 13.00.this should help find deals.
I have bought new laptop batteries that are inexpensive because of being a high demand battery. Tgen i take them apart to get the 18650 batteries. Benifits are i get 6 or more same batteries with solder tabs and it costs about 10 to 12 bucks delevered. And they are good ones also. Just thought i would share.
Build a Laser Cut and Soldering Dobot Robot Arm