If you don't need red text on the dial, those older Sea Dwellers are relatively good value, and I find the high domed plexi *extremely* charming. They are thick by the numbers, but so much lighter than later models with sapphire that I find them to wear really easily. I don't have one myself yet, but it's going to happen one of these days.
17,803 Rolex listings are live on the eBay market and 1886 collector listings on the WatchProSite marketplace.