Hobby Link Japan is having a Holiday Blowout Sale between now and Dec 11 (Japan Time). If you pay by Paypal you get free shipping.
Right Stuf is also in the middle of their annual 12 Days of Christmas Sale.
And J-List has their Fuku-Bukuro, or Lucky Bags, available again this year. They are basically grab bags made up of merchandise available on their site. So you won't know what you're getting until you get your bag, but the total retail value of the included items will be more than you paid for the bag. I've actually ordered 2 of these for myself.
