One of my favorite things to make instead of buy is grape jam! I grow concord grapes and there is just no comparing the flavor from homemade jam to store bought. It's one of the simpler canning recipes out there, though it can be a bit tedious at first.
Grape jam is probably the only preserve I make every single year! It's also one of the simplest preserves to make. All you really need is grapes, sugar, water and lemon juice. First you separate the grapes and cook them apart, then strain, blend and combine and cook again. That's it!
It's also really easy to water bath can grape jam, so if you're new to canning...it's a great way to get started without investing a ton of money.