SpaceX ran a promotion for employees where everything was 50% off. A few of my friends worked there and I was broke so for 2.50 for cofee mugs, hats and shirts was pretty attractive. I was a spacex brand whore for 6 months due to poverty. Love tge company though, if you can ever tour that facility I cant recommend it enough
Beyond that, I prefer to order t-shirts with my own design; $random-company swag frequently ends up as home/nightwear for either me or my SO.