mixed grey hair for braiding

Can anyone suggest where I might look to find grey hair for braiding in Maryland (PG County). My hair is 75% gray w/25% ashbrown in the front and 95% ashbrown w/5% grey in the back. I can't be the only one with this problem. I have had my hair braided twice in the past 4 months and although the styles were fine I was not satisfied with the overall color. The first stylist used #44 which was entirely too dark for my hair. I bought #51 (90% gray/10% black) for the second time and althought it was a better match than #44, I know that there has to be something closer to my hair color. Any suggestions would be greatly appreciated. Brenda