When we travel, instead of buying "regular" souvenirs, we ONLY buy Christmas Ornaments for ourselves. Then every year as we decorate the tree, we remember our trip.
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While doing our frugal travel to Arizona this summer, I realized that part of my travel fun is visiting local second hand, thrift stores, and even garage sales. Often I see regional team, theme parks and other tourist stop items are available there used.
When buying souvenirs when you travel try to buy something that you or the person you are buying it for can actually use. Try to avoid buying something that will just be sold at your next garage sale.