Update: Two weeks since my latest request for my stickers. No sign of anything yet.
While that may not necessarily be news, I think it'll be interesting to keep a timeline running here and finally update everything with a picture when my stickers do finally arrive. I do find it interesting, however, that GetGlue has changed their policy on sticker shipments yet again. Originally it was a requirement that you had seven stickers earned on your account before you could request them. Then it got bumped up to 15. Now the bar has been raised to 20, with the additional proviso that they will only send you 20 stickers at a time because that is all a standard envelope will hold with a single stamp.
I can understand the new limitations. It makes sense that they would limit the number of stickers sent out at once, because if they sent out all the stickers everyone requested at the same time it would be a killer on the cost of shipment. Unfortunately they've swapped the cost of shipment for what amounts to a logistics nightmare: keeping track of what they've sent to who. Best of luck to them in managing that database.