Lanser via Amazon offers the Tacklife Lawn Sprinkler Head, model no. GS02, for $12.99. Coupon code "T5CDB6QV" cuts that to $5.98. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.62.) That's the lowest total price we could find for a similar sprinkler by $7. It features a spray diameter of up to 32 feet.

Update: The price has dropped to $10.99 before coupon, $5.06 after.