Costco offers its members the Lifetime Brighton 8x15-Foot Storage Shed for $999.99 with free shipping. (It costs non-members an extra $100, but you can sign up for a membership for $60.) That's the lowest price we could find by $475. It features two 30" shelves, a 90" shelf, two windows, two corner shelves, and a 749-cubic foot storage area.
These freebies are available to anyone with an internet connection, including both Amazon Prime members and nonmembers.