In case you missed it in the blizzard preparation, Sotheby’s raised the lower limit on its commission structure:

The first change in Sotheby’s rate structure in nearly two years means that beginning Feb. 1 buyers at its auctions will pay 25 percent on the first $200,000 of a hammer price, up from a previous low threshold of $100,000; 20 percent on the value between $200,000 and $3 million, up from the previous range of $100,000 to $2 million; and 12 percent on any amount remaining above $3 million, up from the previous upper threshold of $2 million.

Sotheby’s Raises Its Rates for Buyers  (NYTimes.com)