True Amity, 5 bags total is $65. That would last a long time, especially if your only feeding one hamster.
You can freeze food that you aren't using. Probably order 1 or 2 bags to make sure your hammy likes it?
I also had Chloe on Kaytee Forti diet blocks (only) & she's about 2 yr & 4-5 mo old right now
I'd try to buy hammy food in the stores, if possible