It used to be that nobody made them, but Empire seems to be big enough to be tempting manufacturers. They can be difficult to find online, but are defiantly present in the field. Winterforge armouries do some beautiful ones. Mine is disguised as a walking cane, and was from skian mhor. I have also seen a good selection in Having a Larp.
As an aside, I find shield+rod is a far better loadout for keeping mages alive than Battlemage (armour+shield); I don’t find you lose that much from losing a staff’s range, as you have the shield to protect you as you close.