They've been taken off the market in the US.

Yes, old style drop side cribs have. They still have a newer style and they can be purchased on Amazon

https://www.amazon.com/SafeAccess-Portable-Non-Folding-Compact-Natural/dp/B07PRXPJQR/

It is a smaller crib so it won't work for all babies but I have seen a great many toddlers happily sleeping in play yards and they are the same size.