Best Choice Products takes an extra 20% off a selection of gardening items, via coupon code GARDENING20. (Scroll down and click "Patio & Garden" and then click "Gardening" on the left sidebar.) Plus, all orders bag free shipping. Deal ends August 20.

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A couple of best bets, with prices after coupon:
-- BCP 18" Rolling Lawn Aerator w/ Tine Spikes for $24 (pictured, $56 off)
-- BCP 15-foot Walk-in Tunnel Green House for $91.18 ($159 off)