maybe not yet, unless a super early company, since no one is worth the round they raised in the last 6mo, which is what determines the strike price you'll get today. You're either looking for a down round, or a company that hasn't gone up yet.
Or a public company that took it in the chin over the last 4 months. With public companies you get the market price at the first board meeting after hiring, and you don't take quite as much risk of your stock being totally worthless as you would with a down round or unknown company.