Avocados tend to fluctuate in price throughout the year. If you're the type to stockpile them when they're cheap, you probably know that keeping them fresh is difficult. Food blog Eating Richly suggests you mash them up with a little lemon juice and freeze them for as long as you need.
Freezing fruit isn't a new idea, but the idea of freezing avocados might not have have occurred to you. The process is pretty simple: peel and pit the avocados, mash them up with a little lemon juice, then seal the mash in an airtight plastic bag in the freezer. They should keep for a full year, which means that the next time you see avocados on sale you can stockpile them to your heart's content. Hit up the blog post on Eating Richly for full directions.