Air conditioner supports can be purchased online through The Home Depot, Grainger, Lowe's and ACE Hardware. As of March 2015, The Home Depot website carries a variety of air conditioner supports from brands including DuctlessAire, AC-Safe and Ramsond.
Air conditioner supports that are sold through The Home Depot range in price from $30.97 for an AC-Safe universal light duty air conditioner support to $79 for a DuctlessAire stainless steel outdoor wall mounting bracket.
Grainger sells two different models of AC-Safe air conditioner supports. The least expensive is the AC-80 model that can support up to 80 pounds and costs $51.75, while the most expensive is the AC-160 model that can support up to 160 pounds and costs $68.55.
The Lowe's website carries two different kinds of air conditioner support brackets that are manufactured by Frost King. The least expensive model costs $31.98 and can anchor up to 80 pounds, while the most expensive costs $39.98 and can handle air conditioners that weigh up to 160 pounds.
ACE Hardware stocks air conditioner supports that are manufactured by Outland. The supports cost $33.99 for the 80 pound capacity model and $43.99 for the 160 pound capacity. Both Outland model supports are designed for window air conditioning units.