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budsgunshop.com/product_info.php/products_id/104211/beretta+usa+jmapx159cent+apx+centurion+9mm+luger+15+round+steel+black+finish . Buds price is lower. I do not know if "centurion" makes a difference or not. You could use Chat now and ask a Buds representative.

Why limit to 15? The apx extended magazines will work too, carry with a 15 rounder loaded then carry a 21 rounder as a back up
berettausa.com/en-us/apx-9mm-mag-21-rds-bulk/jmapx219bulk/
Or the 15 rd available here
berettausa.com/en-us/apx-9mm-mag-15-rds-bulk/jmapx159bulk/
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And 17 rd avaliable here
berettausa.com/en-us/apx-9mm-mag-15-rds/jmapx159/
These are all sold on berretas own site and I even says they will work with any of the apx capacities
"The Beretta APX magazine is an easily removable double stack device that allows a rapid reloading of the pistol, the 9mm (or Luger) magazine capacity standard is 17 rounds; optional 10, 15 and 21 will be abailable. "

Andrew, the correct APX 15rd Magazine can be found in stock here : budsgunshop.com/product_info.php/products_id/33399/beretta+usa+jmapx159+apx+9mm+15+rd+black+finish

Get the magazine HERE ( midwayusa.com/product/1019243974 ). APX magazine does not work or compatible with other models. I hope this helps