Right you are!
I have lately been purchasing my dry pack sea scallops at Grash's in Milwaukee, fresh not having been frozen, usual price is in the $20-$30 range but on sale at $18.99/# last Thursday. Had them package the scallops, 6/container about U10 size. I have to confess to freezing a container. The unfrozen scallops caramelized excellently and were some of the best I have eaten.
I have not tried the Costco, no Costco in Wisconsin but what happens when you freeze any product is moisture loss upon thawing evidenced by residual water.
I certainly would like to lower my cost for scallops, glad they worked out!-Dick