Guild Wars 2

is that only available through the gem store?
if I combine Mini Super Banana, Mini Super Yeti, Mini Super Raccoon
do I lose those 3 minis in the process?
meaning i’ll have to buy the bundle again to get them?

yes, to all your questions

That’s exactly how it works.

During the first year or so of the game’s life this used to be fairly common. Almost every release included a themed pack of 3 minis (sometimes more than 1) and almost every pack could be combined in the Forge with another item to make a 4th mini.

They seem to have moved away from that idea, and the idea of mini’s in 3-packs in general, but since the SAB ones pre-date that change they still work that way.