I'm waiting until I "need" $150 worth of stuff there to take advantage of free shipping. Actually, I buy as much as I can from Amazon. Never looked for grip screws but they actually have a fair amount of shooting accessories.
So posting this made me curious and I had to look. Too late for you but this might help others:
http://www.amazon.com/s/ref=nb_sb_no...11+grip+screws