found it! $30/ week grocery list and menu plan
Someone posted this here last year and then I couldn't find it again-- I was using the wrong search terms or something, both on TNH and on Google. Anyhow, in case anyone else was looking too and had the same problem, there it is. At the bottom of the page, it says it was first posted in 1999. I priced the list at my local mid-price supermarket, and I live in expensive southern California, and it's 2005, and the whole thing still was less than $50.