I am a big fan of AppSumo, a very fun & creative company. They fully understand marketing & let their personality shine through (great culture). This...View More mobile screenshot is an example of AppSumo upselling me right before I'm taken to the product I just purchased as well as showing me a referral offer. These are two key steps many companies miss that are crucial to sales growth & AppSumo nails them. They add urgency to the upsell by placing a time limit & use clear, urgent button copy to push the sale. The referral offer is straight-forward, has a clear incentive & makes it easy for people to share it. I've also included an additional example below it that I came across on Twitter from June 2012. This is a very fascinating upsell because even though it's got a huge price tag, they're basically selling dollars for dollars which makes for a very logical buying decision (if you plan to spend that much with AppSumo in the future). I'm guessing the target customer here would be someone who is an ongoing buyer & plans to continue to shop at AppSumo for a while. Otherwise, the risk is too high, even for the $250 difference. Very clever.