How much does this cost to the nearest dollar?

SuperSprings | SumoSprings Rear for Chevrolet Silverado GMC Sierra blue
sold as a pair (left and right) maintenance-free enhances load carrying ability 2600 (lb.) capacity at 50% compression reduces and stabilizes sway Fit type Vehicle Specific Manufacturer Super Springs, Brand SuperSprings, Model Weight 15 pounds, Dimensions 18 x 12 x 11 inches, model number Exterior Painted, Manufacturer Part Special Features Improves overall driver control and ride comfort, Progressive spring rate with superior damping properties, Two-piece unit attached on top and bottom using separate male and female pieces allows unlimited travel, Made from patented micro-cellular urethane, Compress up to 80% of original height with full memory rebound, Rank Automotive Automotive Replacement Suspension Coil Springs 553, Available September

Price is $590.00
Price: $589.99