If the door still opens and closes fine, a local independent panel beater or crash repair shop will likely do a good job for not a lot of money. It may even cost less than your insurance excess, let alone what a claim would cost you over the next few years.
Next best, and slightly more expensive option would be to source a replacement door from a breakers yard. One the same colour would save respray costs.
It would not make financial sense to buy a brand new door for an 8 year old car.