You can make some from local tomatoes, and freeze or can any extra for later. It's a pretty simple recipe, you just cook down some tomatoes and add spices and vinegar.
This I came here to say this, and you can adjust things like the vinegars you use (which can be picked out or made by yourself). The different spice blends you use (they can be made or even better grown by yourself). The the different tomatoes you use (which can be picked out or grown by yourself).