Used car seat and stroller

Amanda • 21, First time Mommy with baby boy! Check out my YouTube if you wanna! Look for Amanda Marie on there (:
Has anyone bought a used car seat or stroller? I found a really nice one for $100. (Britax b agile travel system. Comes with base, stroller and car seat. Made in 2014) Owner says no accidents and the seat doesn't expire till 2020. Opinions?