Looking for Rubbermaid "Servin' Saver™" container
These are listed as "vintage" on Amazon and eBay so I would think they are not being made any more. I found one on Amazon for $14.00 plus $5.49 shipping. There are some complete top and bottom sets on eBay but they are (relatively) expensive, around $15.00 each. I saw similar reusable containers on Amazon for a much more reasonable price, around $1-2.00 each.
And No, I am not affiliated with eBay or Amazon. :)