We all hate these friggin undercutters that cut us out for 1 copper less on the AH. As Buyers: Let's try to make a point to scroll up and buy an item from vendors for 1 or 2 copper more, just to throw their whole scheme off. Buy from people that you regularly deal with, or that have tipped for crafting or chants, before buying from the automated undercutting goblins. Just throw off their scheme a little bit.
I have seen this done on my bag seller, who also does a lot of chanting for tips. People have bought from me even at 12g per bag, when undercutters are posting below 9. Why? good customer service, and a few peeps still believe in loyalty.
Try it out and see what kinda customers you can get to repeat buy from you based on your name, instead of saving a few coppers.