Sorry, can't help you much with an on-line Asian market, maybe someone else might chime in.
Good info Greg, know of any Asian markets online? I am in Montana...not much of an Asian population here unfortunately and I can't find any place that sells those flours at a better price.
Are you in a rural area in Montana? Here's the only reason I ask: A poster on another Celiac board lives in a rural area in southern New Mexico (my state). She says there's a rural Co-Op market in the area where she finds all kinds of flours (gluten-free) in bulk. Don't know if this will help, just passing it along.