The short answer is, it depends.
GF grains tend to be expensive in most stores. Asian markets sometimes carry good alternative grains at reasonable prices. As far as enzymes go, some amylase from the LHBS is what most people use. If you want promalt or other commercial grade enzymes you'll have to find a supplier. If you doubt the sorghum from your LHBS, just order online. In my experience most small local brewshops have heinous prices. I only buy from MoreBeer (local), Austin, Midwest and Northern Brewer.
Primary: Fish Face IPA
Secondary: Perry, Plum Wine, Peach Wine, Mystery White Blend Wine
Bottled/Kegged: GF Graff, Accidentily Imperial Stout, Apricot Wine, Cider, All-Juice Apple Wine, All-Juice Strong Cider, Sparkling Plum Wine, Experimental Honey Steam
Coming soon:, Blackberry Wine, GF Pale, GF Braggot