When looking for the fastest washer and dryer, consider factors such as spin speed, load capacity, and special features designed to reduce cycle times. However, keep in mind that the speed of a washer and dryer doesn't solely determine its performance and efficiency. You should also consider other aspects like energy efficiency, water consumption, and overall reliability.
Regarding the cost, it can also fluctuate depending on the brand, model, and features. High-end, feature-rich washer and dryer sets can range from several hundred to a few thousand dollars. For more accurate and current pricing, it's recommended to visit appliance stores or check online retailers to find the most recent pricing and promotions.