I'm not affiliated with these, but Parallax, Pololu, Sparkfun, Trossen Robotics, GHI, all have some good sales going this holiday. I collected details here: http://www.bot-thoughts.com/p/cyber-monday-2014.html
I am affiliated with my own Tindie store though and I'm running a big sale on Monday thru Friday. Coupon codes in the link above.
Other Tindie vendors are going to be doing a sale. I'll post those details when I have them.