I too have picked up will call orders placed online from Santa Fe Spring CA. I thought it was funny the first time I went there, how they give you your order packaged as if it was going to ship. I could understand why they do that though.
I don't see why you couldn't pick up from the Atlanta location. Easy way to check though, go to their website & log into your account (so your shipping info comes up), then go through the checkout process & see if there is a will call option.