Freddy,
I guess the operative word here is "affordable".
The best probiotics that I am aware of, which was developed for UC as a medical food, is the VSL #3 with 450 Billion active cultures, or if you get the prescription it would be VSL#3DS with 900 Billion active cultures (which might be covered under your plan).
VSL#3 is expensive, but if you can get the DS prescription version, it might be affordable.
There are many on this very forum who have reported that using it has helped them towards remission, if not into remission itself.