For its members, Costco offers the Coleman 100-watt 12-volt Crystalline Solar Panel bundled with the Coleman 7-amp Charge Controller for $119.99 with free shipping. (Non-members pay an additional $8.) That's tied with our July mention and the lowest price we could find by $135. It can be used to power RVs, boats, cabins, and other off-grid needs. Deal ends September 24.