headway 40152S(15Ah) are selling now.

The original post was from almost 2 years ago and the price was never revealed. The discounted price for http://www.protrionix.com/scripts/prodView.asp?idproduct=73 is $34.50 for the 15 Ah cell. Seems to be almost twice the going advertised rate of about $1.30/Ah or $0.36/Wh.

They are not 40152 cells, but they have 20 Ah batteries for $25:
http://www.electriccarinternational.com/Lithium-Prismatic-Batteries.php

Others have found sources of similar batteries for less, but those are usually special deals with factory sources and not an advertised price from a US based company.

I still think that's a lot to pay, although maybe they offer quantity discounts, and you have to take into account the cost of shipping. Here is another source:
http://www.dhgate.com/cheap-40152-l...-15ah/p-ff80808131ae132f0131b975f480490e.html

Or from eBay:
http://www.ebay.com/itm/320918598082

Or contact the company:
http://headway-cn.en.alibaba.com/pr...4/headway_lithium_ion_battery_cell_40160.html

But AFAIK these batteries are for small devices and maybe electric scooters and bicycles, rather than electric cars. And you need some sort of battery holder that will maintain good contact pressure and not be subject to corrosion or loosening from shock and vibration. ISTM that the prismatic cells, with higher Ah rating for less cost, are better for a DIY car.