After seeing pineapples for only $2.50 (!) at the produce market a couple blocks from my house, I bought one and stared at it every day, impatiently waiting for it to ripen. When the time had come, I sliced it up and started adding it to my morning blends.
As an environmental awareness plug, I strongly advocate using locally in-season produce. Fruit gets a little difficult because so many of the fruits we love come from tropical climates. I try to do the best I can by carefully choosing the lesser of all evils. I purchase organic, fair trade bananas at my co-op which ensures that the growing process is as easy on the land as possible (shipping is still an issue, since they're from Central America). While berries are starting to show up in stores, they're not local berries. Our crops won't be ready until late summer, and I will happily wait to be able to enjoy those delicious berries. Instead I'm buying frozen berries which were picked in-season. They're not losing any significant amount of nutritional value by being frozen. Most of these early season berries don't have a lot of flavor and can have gross textures...think of all the miles these delicate fruits travel in trucks! As for the pineapple and avocados, I do buy the conventional versions of both fruits. Organic options for those are often very sparse, and the prices are a little out of my range. While I sometimes wish I could buy more organic or local products, I'm happy for now that I do what I can in at least supporting some of those options.