Woot offers Rubbermaid WaveBrake 2.0 Janitorial Dirty Water Bucket, 18 Quart, Red (2064907) for $10.86 (orig. $28.99).  Free shipping for Prime Members.

Product Description:
Better Behind Our Shield! With features that surpass traditional mop buckets, the new generation of WaveBrake helps to clean floors with less effort to get the job done safer, without sacrificing quality and durability. Improve safety and productivity, patented WaveBrake baffles result in Less splashing while mopping and maneuvering, helping to create a safer environment for patrons and staff. Additionally, water stays in the bucket, eliminating unnecessary trips to the storage closet to fill up the bucket, enhancing productivity. Dirty water bucket, keeping the dirty water separate from clean water. Secure wringer secure connection to mop bucket, providing stability while wringing and maneuvering, to help prevent spills.

• Sold as 1 Each.
• Improve safety and productivity, patented WaveBrake baffles result in Less splashing while mopping and maneuvering, helping to create a safer environment for patrons and staff. Additionally, water stays in the bucket, eliminating unnecessary trips to the storage closet to fill up the bucket, enhancing productivity.
• Dirty water bucket, keeping the dirty water separate from clean water.
• Secure wringer secure connection to mop bucket, providing stability while wringing and maneuvering, to help prevent spills.
• The WaveBrake 2.0 product line is compatible with the following accessories: 2064915, 2064959, 2064999, 2064914 2064907.