You can check out
www.customgreekthreads.com and you can order a polo with AXD letters and then add the embroidery option... other than that if you're just getting it for yourself, you can purchase the polo you want and then take it to an embroidery place (some are little stands in the malls where I live) and have them do it. I got a quote from them once and it was $10 to embroider the greek letters, Alpha Xi Delta written underneath, and our names. Hope that helps!