I think including the car adapter would make the deal much more realistic for the $17 price point, especially given how much business this forum brings to your company. Can you throw in the car adapter for free please?
The WP2 II can use the same car adaptor as the original WP2 according to Xtar. I think they could do a better price if combined with batteries or more than one charger as shipping costs them around $5-7 just for one charger, but only a few more $ to add another to the order.
That said, I would buy this charger at $25, maybe even $40 if that was what I had to pay, (and I didn't already have 2) it is very good.
edit: this offer seems to include adaptor (flat or round) but not so sure about that eBay link. Any experiences? I already have a 12V powersource so no particular need for another one...