These waterproof zippers are a little bit different but I would suggest searching for a luggage repair shop near you. Sometimes upholstery repair shops will also fix golf bags. Worst case is they may have to change the waterproof zipper to a conventional one if they can't get something to match. Hope you get it fixed as the bag still looks great and it would be a shame if you had to replace it just because of the zipper. I have an original StaDry 4UP but only use it on trips to rainy places because I have the same concern, that these waterproof zippers do not have the long term durability of a conventional zipper. Hope it works out and you are able to get it fixed.

Houston is a very big town, but would recommend googling "luggage repair shops" in your particular area and following Dale's lead. That is very pretty bag and I hope you can get it repaired.