When you promote something that is a great deal, like high value for a low price, you should focus your email on that amazing value first. Start by talking about a problem your subscribers have, and then show how this cheap item is the perfect, easy fix for that exact issue. Since it costs very little, you can be very direct about the benefits without seeming too pushy, because people are less worried about spending a small amount of money. You should share a quick story about how you personally found this item useful, making it feel like a genuine tip from a friend, not just an advertisement. What kind of subject line do you think best highlights a great deal without sounding cheap?