The ones we have tried are either against the signalling peptide or do not recognise small levels of expression. Or show only one band in Western analyses.
I would recommend a free antibody database available at labome.com. For antibodies to CaSR for WB you can check the following link: https://www.labome.com/gene/human/calcium-sensing-receptor-antibody.html. Invitrogen has mouse monoclonal (5C10, ADD) and rabbit polyclonal anti-CaSR abs for WB. Also, Novus Biologicals offers mouse monoclonal (HL 1499) for WB. Moreover, Santa Curz Biotechnology provides mouse monoclonal (6D4) and goat polyclonal (N-14 and F-19) abs for WB. In addition, OriGene, LifeSpan Biosciences and US Biological have rabbit polyclonal and mouse monoclonal anti-CaSR abs. Also, Abnova has mouse monoclonal anti-CaSR ab HL 1499 for WB. You can see the description of these antibodies and references following the links to the suppliers.