Aspartame can be found in thousands of products such as:

instant breakfasts
breath mints
cereals
sugar-free chewing gum
cocoa mixes
coffee beverages
frozen desserts
gelatin desserts
juice beverages
laxatives
multivitamins
milk drinks
pharmaceuticals and supplements, including over-the-counter medicines
shake mixes
soft drinks
tabletop sweeteners
tea beverages
instant teas and coffees
topping mixes
wine coolers
yogurt

Source: Mercola.com