Cathi (or any Titleist concierge) .... can you help .... please, please, please!

I received the Lightweight Cart bag as an early Christmas present. It's a great bag since I don't do a lot of walking that much anymore. Problem is that it was sold to my mother without a Rain Cover in the bag. Everyone knows that getting clubs wet can be a disaster to any round. Not to mention, I use it for the added protection of my fabulous Titleist clubs when I travel. Is there any possible way I can get one that would fit this? I would happily pay for it if need be.

Thanks for your help :)