Woot offers RUNFast 40lbs Pro Weighted Vest for $36.99 (reg. $79.99) free shipping with Prime. 

Product Description:
The Runmax 40Lbs Pro Weighted Vest Is A Great Way To Add Resistance To Your Workout. This Is A Great Vest To Start Your Cross Training, Strength Training, And Anything Else You Will Need A Weight Vest For. The Vest Is 15" In Length From Your Collarbone Down And 13" In Width, Which Makes This One Of The Most Compact 40Lbs Weighted Vest In Its Class.

• Country Of Origin : China
• Weights Are Adjustable In 4 Lbs. Increments, Max Weight Is 40 Lbs.
• One Size Fits All Sizes
• One Piece Design With Belt Attached Onto The Vest For Easy Setup