ThinkGeek apparently uses Gildan shirts, which are cheap, baggy shirts made out of thick cotton; you were probably buying shirts of similar quality when you bought plain shirts.
Since it seems you're spending more on shirts now, you're probably getting a better quality product. Plenty of stores from Target to Gap to American Apparel and so on have better-fitting shirts made out of lighter-weight material with no visible logos, likewise in a range of prices.
Since it seems you're spending more on shirts now, you're probably getting a better quality product. Plenty of stores from Target to Gap to American Apparel and so on have better-fitting shirts made out of lighter-weight material with no visible logos, likewise in a range of prices.