NEW YORK — Peloton plans to sell its deluxe stationary bike at Costco this holiday season as the struggling connected-exercise company seeks to broaden its customer base. The Peloton Bike+, a stationary bike that enables riders to participate in online classes and work out with a virtual community of friends, will be sold at a discount online and in 300 Costco stores from November through mid-February, the companies announced Tuesday. The model will sell in Costco stores for $1,999 and will require self-assembly.