How about a treasure map shop somewhere and you pay a set a mount for a map say like 500g's Then you get your map and you get one of a hand full of items similar to the blob boss. 1.new bombs 2.gralats 3.morph/mount/pet 4.2-3 different kinds of hats 5.more gralats and like those two things after you dig up and get the treasure you would have to wait a "cool down" period before you could buy a new treasure map and try again.