American Gas Association (AGA) gas ranges and cookers are powerful tools in the hands of any cook, but they are also quite expensive. A brand new AGA cooker costs between $10,000 and $18,500. Used gas ranges in good condition can be found for less than $7,000. Shipping and installation costs are two more important factors that must be considered when budgeting for the purchase of an AGA gas range. These two costs may add as much as an additional $1,000 to the bill.