The Howard Hughes Medical Institute offers a collection of science and medicine-related DVD’s for educators, absolutely free. Most of these seem to be at a higher level (I’d say at least middle school, probably higher) but I ordered a selection of them to watch with my kids. Some of the subjects I picked were genes, evolution and a virtual lab CD-ROM.
We’ll donate them to the library when we’re finished with them so even more people can benefit.
There are also some PDF lesson plans to accompany some of the DVD’s.
These are absolutely free, even shipping. What a great resource!