The best time of the year to buy electronics (and other stuff) is on Black Friday, which is the day after Thanksgiving. On November 25, 2011. Both online as well as in-store.
If you shop in-store on Black Friday, especially just when the stores open, combat boots and a flak jacket is advised! That's why I prefer online.
------------------------------All things cometh to he that waiteth - provided he that waiteth, worketh like hell while he waiteth! Reply to Ubrales
Keep in mind, since you're most likely looking for an HP, I recommend buying direct. NewEgg is great, but support options are always limited. If you're not a power user, here http://bit.ly/ricpSo
------------------------------Although I work with HP, these views are my own and not of HP. Reply to HPrometheus