Community take a guess as well in either strange coins or units sold. Icebreaker sold over 17 million strange coins or 1 million IBs purchased so with that baseline....................................
I'll say at least 35 million strange coins or at least 2 million Jellys got sold..
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Well, the last time Icebreaker went on sale, Deej commented on how many strange coins were spent on Xur. Since Xur selling Gjallarhorn is a fairly historic event and the sales will probably be very high I'm sure Bungie will eventually comment on the sales figures.