Thought this deal was too good to keep to myself!
American Apparel has basic v-neck t-shirts on sale for $10 each (down from $30) in selected sizes and colours (I haven't checked all of them but there is a good range of colours in most sizes). I've been buying these shirts for years and they're a good quality staple in my wardrobe. Every few years I'll buy more and I haven't seen them selling this cheap before.
Also, free shipping for orders over $100.
They have some really stupid stuff