I cc a glock 19, so the mags aren't super easy to pocket.
Lowe's usually has some generic knife and flashlight/tool pouches that would be the right sizeThe LCP mag is pretty small for most pouches I have seen.
Training to do quick mag changes requires easy access, as do malfunctionsOther than in the movies or on TV, I have never heard of a gunfight in real life where it would be necessary.