Not a recommendation of quality, but you might want to look at those pAbs offered by both Biorbyt (https://www.biorbyt.com/s100a4-antibody-orb6910.html) and antibodies-online (https://www.antibodies-online.com/antibody/703706/anti-S100+Calcium+Binding+Protein+A4+S100A4+AA+15-101+antibody/)