engwar wrote:
I have poor clay soil and am interested in using cereal rye in my
veggie garden as a winter cover crop to improve it.

Has anyone tried this and what was your experience?

Also, where would one go to purchase cereal rye seeds for a relatively
small vegetable garden?

I'm in zone 6, by the way.

How small is your "relatively small" garden? It may be small enough so
as not to be worth the trouble of sowing and turning it.

But anyway, any garden or farm center should either have winter rye seed
or be able to direct you to someplace that does.