can't you get 5 tall thick white ts at foot locker for 20 bucks?
Also check out Redwood Trading post on el camino in RWC kinda by sequoia station, I'm sure they would have rugged thick white work shirts there, they probably ain't hella cheap but they sell quality work clothes there and probably got something like dickies ones
I dunno why there are so many threads about this, it ain't like there is some kind of shortage on white T shirts