I can't remember any significant firearm-related BF deals the past few years. If you come across a good deal now, I wouldn't wait.
Keep in mind, this is nothing like the BF deals you see at Fry's or Best Buy. You're not gonna find Glocks for $400 or anything like that. If you're looking for an upper, Palmetto has been having good sales as of late. It's hard to imagine prices dropping much lower than what they are now.
Also, with this being an election year, who knows what prices/inventory will look like come Thanksgiving.