Frozen vegetables. Not very exciting. I know...
It's like your first run to the library, pre-DVD. There's all this knowledge and books and it's freeeeeeeeeeeee. You get to take it home for nothing. Vegetables are like that. Only, you can't loan them out. But, they're low calorie, some nearly calorie free, and you get all these health benefits for next to nothing.
Lately, I've been noticing coupons for Green giant vegetables. They have a steamed variety similar to Bird's eye Steamfresh as well as having a "Just for one" variety. They also go on sale frequently, so coupon + sale = healthy food for 1-2 bucks.
I like using the lightly seasoned ones with pasta, easy and nutritious.
It's also portable, you can take the box or bag to work, and if you have a microwave, you have fresh veggies all you have to do is add some lean protein (last week I snagged canned tuna for 50 cents) and you're good to go.
It would be awesome if vegetables had their own card. I'd use a veggie card. Only, the vegetables can't be "used" and on loan. That would not be awesome.