You have to be really careful with the "LMR equivalent" stuff. Some of it is made in China. While it may have the same overall dimensions, it may have less shielding, thinner jacket, different materials, etc.
Sure Call makes cellular boosters, and I doubt they have their own coaxial cable factory. It's probably something made for them, but unless you know for sure, it would be a gamble.
My approach to this sort of stuff is that decent coaxial cable should last you 10 years or more. The -real- cost isn't in the price of the cable, it's in the installation. Installing antennas can be hazardous, so cutting corners on the cable to save a few bucks now may very well bite you in the posterior later on. Having to go up in a few years and replace failed cable will be a royal pain.
So, you have to ask yourself if saving a few bucks now is worth the extra labor down the road...
You also need to be careful about "pre-installed" connectors. I've found that some use cheap connectors and hide that under strain relief or heat shrink. Cheap connectors will cause headaches down the road.
