Hehe.. about 50 cents a pop vs. about 2 bucks a pop retail.
If you REALLY wanna fry some LED's, get these:
http://cgi.ebay.com/8-AA-3-6V-2400mA...QQcmdZViewItem
Lithium thionyl chloride 3.6V *PER CELL*
Feel like running 7.2V through a blinker? Hehehe..