Eh, boxing day sales have been pretty lame since the invention of the internet IMO. Sure there'll be one 37" LCD for $150 in a store, but it's a 60 Hz refurb and they are magically out of stock on all hdmi cables except the $150 monster cables.
If you line up early you'll snag an old something for cheap, but most of the rest of the day it's just people buying normal stuff at normal prices.