I would stick with ARS. Well built and can be used with multiple size tubs to fit your collection. Freight shipping allows for inspection before signing off. You only have to spend extra for a transition support to fit small / large units onto one rack.
Believe they still have the "billmelater" option to spread payments over 6 months: interest and finance charges free.

Don't think you'll find used ARS on the market just yet.

Mike