Walmart offers the Element 3/8" x 75-Foot Soaker Hose for $10.12. Opt for in-store pickup to avoid the $5.99 shipping charge. (Amazon charges the same slightly less with free shipping for Prime members.) That's the lowest price we could find by $3. It features a water rate of up to one gallon per foot per hour.

Update: The price has increased at Walmart; however, Amazon still offers it for $9.99 with free shipping for Prime members.