Usually there are sales or Christmas Promos... but then again if you think you've got a good deal now then why wait? How much longer will you want to wait for what you could be enjoying now, and how much will prices drop to make the enjoyment now vs cheaper later factor in? Too much thinking leads to analysis paralysis!
Prices for Samsung b530 40" and 37" seemed to have dropped by 8k and 6k respectively since August, however the 32LG53, 42LZ80 and I think the 32lf20 have not really changed prices since then. It is probably since the latter models are "old" and may have reached their "rock bottom" prices... but who knows the longer these thing stay un-sold the more compelled the sellers may be to ditch them therefore giving lower prices. For the newer models they might also go down now that the "next year" models are coming out. I take the 42LZ80 as an example, where I think last year it came out at almost 100k, if I'm not mistaken, and is now half that price at about 45k?