Actually, there's a surprising amount of US depression glass here in reality, considering much of it's production period was covered by Wartime. Royal Lace is usually found in green, in fact the bulk of Depression glass here is green, but in far fewer patterns than over the pond. There are, however, items found here that are scare over there. My OH found a trinket bowl for the Jeannette Floral (aka Poinsettia) dresser set for £1, it went home for over £80 excluding p&p. I suspect much of it has just been thrown out as Granny's old glass tea set as it wasn't Granny's "best china".
I haven't seen a cookie jar though, so it probably has a market here.