You can still find silver Open Pro’s on eBay from time to time, set up a search and get notified.
Excellent rims, I have several wheels built with them and they have survived Cino, Eroica, and many week-long tours without any problems.
Open Elites - pretty similar rim, single eyeletted instead of double- are a good second choice for a road rim.
If you’re looking at somethign other than Mavic rims, check out Kinlin rims. Very robust, hold a true, look good.

A23’s are excellent rims, make a very strong wheel, especially if you use an asymmetric rear. Wider than Open Pro’s.