A few months ago I bought a bunch of these Pyrex food storage dishes in various sizes and got rid of the old plastic containers we'd been using for years. I am sorry I didn't make the move sooner. They are great for microwaving, and they don't get stained when I store tomato sauce in them. I haven't put these in the freezer yet, but the manufacturer says you are allowed to. The lids are BPA free and can go in the top rack of the dishwasher.
To start, get four 1-cup dishes ($(removed)), a 2-cup dish ($(removed)), and a 4-cup dish ($(removed)).