Thanks, Anarie. I should have thought of that, I remember receiving a mailer from my favorite seed supplier about goji berries.
Here's a link to their page of information about growing, harvesting, and even drying them!! I think I could add a couple in containers on my patio, and transfer to the groud if they do well in our heat.
The fact that this magazine has a recipe using an odd ingredient, makes it suspicious already. That recipe has been done 100 times using any berry you want, don't be mislead by something not easy to find. The Health Food Industry is a disgrace.
I just saw that you're a gardener. Goji berries are apparently pretty easy to grow and both heat- and cold-tolerant. If you try the dried ones and like them, look into growing your own. I saw something that said they're perennial for zones 3 to 10!
In the US you can only get dried goji berries (and I'm sure that's what the recipe means.) They taste sort of like raspberry/cranberry/banana. The closest thing in taste and texture would be dried cranberries, but since they're usually loaded with extra sugar, if I were looking for a substitute in that particular combination, I would go with dried tart cherries or blueberries. Or, if you have access to them, dried unsweetened raspberries.
But look for dried goji berries first. They're easier to find than you might think, and price has come down recently. If there's a store near you with a "natural foods" section, they'll likely have some.