If the party mage already has good bracers, and they don't want to sell them for cash, then give them to the armored characters with the lowest Dex bonus. They'll be useful if the party is ever attacked by incorporeal undead.
Incorporeal touch attacks pass through all physical armor, but not the force armor created by the bracers. So even though the bracers' bonus overlaps the normal armor bonus most of the time, the normal armor bonus goes away for purposes of incorporeal touch, so the bracer bonus remains.
Example:
A fighter wearing full plate has AC 18. If he's attacked by a wraith, it can pass right through his armor, so his effective touch AC is 10.
Give the same fighter a set of bracers of armor +2. He still has AC 18 for purposes of normal combat. But when the wraith attacks, it can't pass through the bracers' force field, so the fighter's touch AC is 12.
This isn't much bonus, and the situation doesn't come up all that often, but it's better than just leaving the stuff to rust in a backpack.