Maha Energy Corp., the maker of the PowerEx batteries and chargers have announced their latest Lithium battery packs for Digital Cameras. The MH-NB2L Lithium Ion battery for Canon Powershot S30, S40 and S45 series will retail for under $40 and the Lithium Polymer MH-ENEL2 for Nikon Coolpix 2500 and 3500 cameras for under $30. Both are designed to be 100% interchangeable with the original and have up to 20% higher runtime.
UPDATE: Corrected model numbers in press release.