How much does this cost to the nearest dollar?

Permatex Rust Treatment - 1 Gallon, (Pack of 4)
Permatex Rust Treatment destroys old rust and prevents new rust in one step. Just brush or spray on and within minutes rust is replaced by a durable black polymer coating, which can be painted and serves as an excellent protective primer. Specially formulated to be used with body filler and fiberglass, this rust treatment can be used in temperatures between 50 degrees Fahrenheit and 90 degrees Fahrenheit and on surfaces which do not exceed 200 degrees Fahrenheit (93 degrees Celsius). Destroys rust on all automotive applications, trucks, trailers, storage tanks pipes, valves, fences, bulkheads, overheads, decks, hatch covers (topcoat with appropriate marine paint), agricultural equipment, plows, tractors, and snow removal equipment

Price is $306.00
Price: $305.99