I also have a problem with medicare covering more than one tube a month. The surgilube tube is 4 1/2 oz, so i had to switch to another brand thAt was 4 oz. I think i finally ordered from amazon, but I don't remember the price.
i have been using vitamin e oil and pour it into a small squeeze bottle (got at REI, but they don,t have them anymore) Thank you to Sharon from Paris for suggesting olive oil also. When I mentioned the oil to Dr. Shen, even he seemed surprised!
I also get catheters from edgepark and change them about every 1-2 months.