Woot offers Schwinn 2 Seat Echo Child Bike Trailer for $69.99 (orig. $199.99) + free shipping with Prime.

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Product Description:
The Schwinn Echo double bike trailer is equipped with 20" alloy rims with air tires that provide performance and style. The large window and mesh surface area for better transparency and style while the bug screen keeps the child insect free, dry and keeps your child cool. Seat includes helmet mesh and shoulder pads for passenger comfort while the universal trailer coupler attaches to most bikes with ease. There’s plenty of room for storage in the rear, but the back cover only secures in place with a basic strip of velcro. If you’re storing small, light items like sweatshirts or a helmet, you’ll probably be ok.
 

• Tow behind style bike trailer, universal bike coupler will fit most bicycle rear wheels, 5-point rider harnesses with shoulder patches, safety flag for extra visibility
• Two-in-one canopy, bug screen and weather shield options, rear ventilation window, two riders and room for 12 pounds of additional gear in rear area
• 20 inch alloy spoked wheels with air filled/pneumatic tires for performance and style, large side windows
• Fits in the back of cars or closet. The frame collapses and the wheels remove. Comes with a coupler that will attach to most rear bike wheels
• Assembled 51.8" x 32.5" x 31.9"', fits two riders up to 40 pounds each. Features a small storage space behind the seat for water bottle or some cargo