TomTop offers the WY8124 Solar LED Rechargeable Camping Lamp for $10.54. Coupon code "CXY6556" cuts it to $9. With free shipping, that's $10 off and the lowest price we could find. It features 300 lumens of brightness, ABS construction, and USB charging.
Note: These ship from China and may take up to four weeks to arrive.
Planning for retirement savings to last until you are 90 or older is a daunting job. Make these errors, and the task goes from "difficult" to "impossible."