Re: Making your own baby food
Because we kept DS on a pretty much vegan diet until he was 2 years old, I had to make a lot of his food, though I could buy things like single veggies and fruits. I got really involved in label-reading, too, so we could buy things like crackers, etc, if I knew they were vegan.
I'd buy unsweetened applesauce in the big jar, or later in the snack-sized containers - it was a lot cheaper, like you said. Bananas could be mashed (add a little bit of lemon juice to keep it from turning brown), and mixed with other things. We used to mix bananas with a little bit of soft tofu to make "banana pudding" with some protein in it. When he was older, we had a small manual grinder, so I could take a few spoons of whatever we were eating and he could have some.
I got the book "Super Baby Food" as a shower gift, I think - it had some great ideas and recipes for baby food in it.

I know Yammie made most (if not all) of my niece's food - I'll have to ask her to post ideas for you.