I have observed them at Trader Joe's and Focus on. Make sure to select up freeze-dried blueberries, not dried blueberries. Dried (or dehydrated) blueberries are chewy in lieu of crisp because they haven't got all their water eliminated. Insert the blueberries: In my recipe I take advantage of dried blueberries, https://blueberryfrostingfragranc25677.blue-blogs.com/38382470/an-unbiased-view-of-blueberry-frosting-using-frozen-blueberries