Here are several bathroom sinks for sale.
The first one is a used little plastic sink for an RV or small space. with the drain attached. $10.
The second is a used ceramic vanity top to go on a 24" vanity base. It is 18" deep and 25" wide. and has a faucet, $45.
The third is a used plastic three hole drop-in sink for $15.
And the fourth is a NEW expensive ceramic under counter bathroom sink for $50, these cost many times that at the store.
For security reasons you can understand that we do not give out our phone number or address until we have a name and phone number or email address of the inquirers. It is also a matter of politeness on the potential Buyer's part to introduce themselves.
That precaution is in the Help Forum of Craigslist, as Sellers need to be able to identify anyone who is coming to their door in case it is robbers or a scam of some kind. It is sad that it has to be done in this day and age.
Thank you for looking.