None that I am aware of. I bought the BMW spare after delivery and got a fair price. but, i do not have a 3rd row so it fits perfectly in the storage (where it would go if ordered originally) just w/o the bracket - fits perfectly so no biggie. It is bigger than the little mini(s) and still has the same mileage/speed limitations. Looks almost like a full size - just narrower. Doubt a mini would even work. And, as you already realize - storage is an issue.

RFs have their place but if you drive on them (flat), even a few miles, they will likely be unrepairable. Some post having them plugged but that is likely after a very brief drive. They are expensive to replace and the ride is way less than the better non-RFs. Clearly, a compromise either way.