In several threads, I've seen this cigarette lighter listed as a direct replacement, that additionally fits normal size plugs.
http://www.gowesty.com/ec_view_details.php?id=4471
It costs 17.95 + 7.90 shipping, total $25.85
However...
I did some more searching and found a cheaper source, for the same exact item:
http://www.van-cafe.com/home/van_139...hter-p697.html
It only costs 15.95 + 7.50 shipping, total 23.45.
OK, it's not incredibly cheaper, but it's still cheaper. Almost 10% cheaper. And all other things equal, I like to save every penny I can.
Van-cafe.com lists it as shipping UPS ground for like $12, but they say on the webpage small items will ship USPS priority mail. I called in advance to confirm, and yes, it ships USPS priority. I also put a note in the comment section when ordering to ensure it was shipped USPS. My credit card was charged 23.45 and I should have it in a few days.