A way to save money (and free your arms) is to wait until the end of your trip to purchase souvenirs to take home.
This gives you the chance to scope out prices, which can vary greatly in touristy areas. It can also give you a better sense of what’s available, so you don’t wind up buying all junk.
If you find something unique, you should snag it, but otherwise set an afternoon aside for souvenir shopping.