look for them near the ziploc bags.
ZipLoc makes containers, so does "Gladware".
Also, Rubbermaid makes some disposable containers.

Not sure where you are, but Walmart carries them near the Rubbermaid
containers and plastic wraps and bags. The ones Sheldon refers to cost
about $2 for a package with 4-5 containers.

Also, there are containers available at most hardware stores, usually
near the canning jars, that are square in shape, they are usually known
as "Freezer containers".

Another thought is those 1lb containers you buy potato salad (or other
such items) from the supermarket in.

Although, I don't know what your aversion to freezer bags is.
They hold up fine, lie flat in the freezer, take up very little space,
are stackable and once frozen, can stand up right, thereby taking up
even less space. I have bags of homemade chicken stock in my freezer,
about 2 cups in each bag, taking up very little room. IT's a great
solution, as far as usage of space and they are not expensive, either.