I am getting back into mini painting after being away for 25 years.
I bought a Gundam and an Armada ship from Mantic the other day so I can sort of figure out what I like to paint now. Years ago I was all over Epic 40k, and BattleFleet Gothic.
I was looking at base coating, and noticed that the GW spray paints are 25$ a piece.... which is flipping insane! Sadly it was all the store had.
I personally haven't used spray primer in years now, but the recommendations I always got were for Rustoleum. It works great and is widely available for a reasonable price. Especially if you're just looking to get started again.