Shares are bought and sold when the is a willing buyer and seller. No one forces the seller to sell to you. No forces you to buy. So you choose shares you think are cheap but that doesn't mean that they are cheap.

Warren Buffet thought Tesco was good value but now regrets it. Currently the market for most shares is high particularly in the US. so with the possible exception exceptions of military suppliers and miners my advice is avoid buying now

If you're willing to take a big risk, penny stocks are very cheap and some of them had phenomenal returns but others, plunged to ZERO.

many stocks trade below $50

you could check NLNK the ebola vaccine stock, or LULU the athletic clothesmaker

ISIS