If you're not planning on spending much, you'll appreciate this Asos T-shirt. It's a fail-safe choice and a good investment. In this price range, you can also look at this Asos Tank. It's also a popular item and won't break the bank.
For something in the middle of the price range, look no further than this Asos Crew-neck T-shirt. This item doesn't cost the earth, but absolutely essential in your wardrobe.