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Hi John and welcome. A bit expensive but available here: https://www.xtechtactical.com/product/p365-380-magazine-with-mtx-plus-3-round-extension-combo/ ------------- or just the kit to convert 10rd magazines to 13rds here: https://www.brownells.com/gun-parts/magazines/magazine-accessories/mtx-365-10-to-13-round-mag-extender-for-380-acp-sig-sauer-p365/

Hi John, also 30rd drum available here: https://www.budsgunshop.com/product_info.php/products_id/714030851/promag+sig+p365+.380+acp+30rd+drum+black

Here's a 12 rounder available here at Buds. https://www.budsgunshop.com/product_info.php/products_id/153688/magazine+p365+.380+acp+12rd