I got mine from petsmart, but I do not remember how much I paid for them. They are nice-- stainless steel with a rubber stopper on the bottom-- stops it from sliding/making noise while sliding (I dont have my pup yet, so im not sure if it really keeps them from sliding lol)
I do believe they possibly were $9.99 US dollars each. (Im new here so I dont know if your from the states lol)