Target has the Canon EF-S 55-250mm f/4-5.6 IS STM for $149.99, when you add the item to cart. As Target is an authorized Canon USA dealer, this is the lowest price seen yet from an authorized dealer with a 1-year Canon USA warranty.
This lens is already considered one of the best value lenses in the Canon line-up, and at half price ($150) it is a steal. Unfortunately, Target does collect tax to most states.