Making your own PV can still be an entertaining and rewarding experience. New commercial mods like the Provari from Provape are stretching the envelope of mod technology, but simple 5V and 3.7V mods are still well within the capabilities of anyone with reasonable soldering skills and a drill.
A fantastic example that I’ve been meaning to build for quite some time is the “juicebox,” a simple box mod with a bottom-fed e-liquid pump. Highping on the ECF has provided an excellent tutorial. Including batteries and a charger, Madvapes has nearly all of the parts for under $27. Your local hobby shop should have the brass tube for under a dollar.