Yes, pre-isolated nuclei are available for purchase from various companies. One such company is Active Motif, which offers a range of pre-isolated nuclei from different cell types. Another option is EpiCypher, which provides isolated nuclei from multiple species and tissue types. It's always a good idea to research and compare the options available from different companies before making a purchase to ensure the best quality and value for your needs.

Thank you very much. This is a big help.