there are many type of gelatin sponge available in the world
like
1)instaspon from insta-cure - the novel gelatin sponge
2)gelfoam from baxter
3)surgifoam - j&j
4)cutanplast
5)spongostan
these are all the are manufactured by different process
cost is depend on manufacturing process
instaspon have optimize novel process to manufacture gelatin sponge very cost effactive
the detailed uses of gelatin sponge availbe on website INSTASPON