Please talk to your doc but I'm not sure how safe it is to be taking multiple NSAID's at the same time. Certainly one at a time they can be great (still some risk, but limited) but by effectively doubling the dose I'm not sure whether you might run into issues with bleeding disorders or ulcers. Definitely should talk to your doc about that.
I think usually it's fine to take some extra NSAID's (under doctor's care) once in a while, but not sure it's so safe long term. Things like Prilosec can help, but they can cause their own set of issues. There are prescription alternatives, but insurance won't always cover them to "prevent ulcers" so check first if you go that route.
You might also check the manufacturer's websites to see if they have any coupons for what you're prescribed. A lot of times the prescription NSAID companies are very competitive and will offer coupons to new or returning patients. Some are only for one month, others are for multiple months up to a year. Might not work out for you, but worth checking. Also, if you start back on them & don't get any coupons at first, maybe check back a few months later to see if any are posted. They tend to be pretty common.
Just don't order them from Canada or anything trying to save money. There were a bunch of people who were recently hospitalized around here for buying what they thought was a brand-name NSAID. It had some other stuff in it that the brand didn't & people got very, very sick almost to the point of death. Turned out they all bought from the same Canadian website. Ironically, the company wasn't even legal to sell meds in Canada. DEA has cracked down on that particular site, but please find other ways to save money.
Also, you might ask if your doctor has any samples to offer you (there were major cutbacks for a while, but the reps are slowly starting to return). Sometimes they can give you a couple weeks up to a couple months worth of samples. I know a year or so ago I got samples of Mobic. It didn't really help me, but it didn't have side effects either. I think my doc gave me 6 weeks worth of samples.