A 5 volt from Ken's is NOT 37.00. You also have to purchase the batteries and charger to really get a complete unit. I checked on it. His 3.7 lettle sister would end up costing me 70.00 plus shipping to get a complete unit that is ready to go.
That's true, but then you have to do that with any bigger battery PV. Since Ken's PV starts out at a lower cost than most, it is still a savings. Another advantage is that the batteries are not proprietary. You can get them for about $3.50 from Deal Extreme and they will last about 10 times longer than small tube shaped batteries. If you want the best PV with the batteries included in the price, then get a Darwin from nhaler.com. Of course, he just put a new shipment on his site at 10 a.m. today and they all sold out in 30 minutes they are so popular. He will have more in on Friday. The Darwin costs a little more than Ken's.