If you've got a single dented panel on a door built in the 2000s, the honest answer is that ordering a matching panel yourself is possible, but matching the exact steel gauge, insulation core, and color from a home improvement store rack is a coin flip. Manufacturers change panel profiles over time, and a mismatched section is obvious from the driveway.
What you can check yourself: whether the damage is cosmetic (surface dent, no bend in the track-facing edge) or structural (the panel is bowed enough that the door binds when it runs). A structural dent on one panel usually means the whole section needs to come out, not just get pounded flat. If you're not sure which one you're looking at, a photo sent ahead of a visit tells us most of what we need to know before we make the 20-mile trip out.