I've saved a ton of money by grocery shopping at Dollar Tree.Ashley ArchambaultI was surprised to find that Dollar Tree has a great food section, with many quality items under $2.Now, I head to the budget store to buy snacks, frozen veggies, fruit preserves, and more.I've also found some great staples, like cornstarch and egg noodles, at an affordable price point.A few months ago, my 12-year-old son and I stopped into the Dollar Tree after schoo…