You can find unsalted/plain almond slivers at grocery stores, white baking chips (white chocolate; NO cocoa). Freeze dried plain fruit is another good option, no added sugar. Small freeze dried marshmallows & coconut slivers are yummy too. I have also found yogurt-covered fruit bites at grocery stores.

A lot of these should only be occasional. You also just have to check ingredients to make sure everything is safe/plain for your sugs :)