But just bumper .. not going to have much different ..
Say even u need a new bumper, with paint/install, is probably under $2K, if you do it from US, may be just few hundred dollar less ... and if the workmanship isn't great after, hassle to do re touch up etc..
Just like body shop in Van is much cheaper then here, but for boby work, I rather stay local!
I suggest stay with local, and depends on your quality expectaction, paint quality, and who work on your car can make a diff. Eg. License body man vs inexperience newbie.
not workable logistically, u need many trips, also u should report the repair to CBSA, if they find out u be in big cha bo.
They have vays of finding out , then u SOL.
Plus may have to go back many times.
Or u have too much time on your hand.