“Sooner Than Expected”
The “my last sale sold out sooner than expected…” strategy tells your prospects that if they are even a little interested in your product, they had better hurry and buy it now. This sale could be sold out fast, just like your last one. You could give them a little more detailed info about your last sale, like: it was scheduled to run for 7 days but sold out in 3 days, it sold out in less than 1/4 the time, etc.