Clothing brands place random sayings or their brand on your shirt. They price it higher than what custom designs. Why do you buy it? You are essentially paying more to be an advertisement.
Instead, get your favourite creators merch or make your own (on sites like Threadless). On the make-your own, you’ll probably also find good designs.
Also consider single-colour shirts, but buy them online and if you can, in bulk. They are much cheaper and don’t give the other person ideas about you.