Home Depot offers the Arke Eureka 63" Spiral Staircase Kit in Black, model no. K21009, for $2,549.15 with free shipping. That's the lowest total price we could find by $644. This staircase is designed for use in straight, round or mezzanine applications, and can be installed clockwise or counter clockwise. It features adjustable heights, steel construction, a PVC handrail, and solid steel treads with durable non-slip PVC covers. Deal ends December 8.