What low cost universal remote controls are available for Sears Garage door openers?

I have a remote control Sears Part# 139.53681 and I want some cheap universal remote controls for my opener.What low cost universal remote controls are available for Sears Garage door openers?
Remember any Security + transmitter will work. Call 1-800-528-6563 Chamberlain tech support in Arizona. They can tell you the model # to buy as they are somewhat different #s from stores such as Menards' and Home Depot. Please do not tell them were you obtained that # and I mean it. It is reserved for dealers but you will normally get through faster. Good Luck! And the last time I heard the ';universal '; stuff was owned by Chamberlain (they make the Sears brand)What low cost universal remote controls are available for Sears Garage door openers?
I've never seen a universal remote, but I've have bought Craftsman replacement controllers off of eBay. Which currently has a couple of these on it going between $20.00 to $28.00.