there are coupons floating around for $149.99 I got one in the junk mail last week. Some entrepreneur is selling the coupons on E-bay for $10.
One e-Bay seller has the $149 coupon on auction starting at 99 cents plus $2 shipping:
Item number: 221025059770
http://www.ebay.com/itm/HARBOR-FREIGHT-COUPON-SAVE-80-THUNDERBOLT-45-WATT-SOLAR-PANEL-KIT-/221025059770?pt=US_Coupons&hash=item33761ec3ba