Amazon offers its Prime members this Syba Wheeled Desktop PC Stand, model no. SY-ACC65029, for $9.10 with free shipping. (Non-members can get free shipping with orders of $25 or more; otherwise, shipping adds $8.71.) That's the lowest total price we could find by $6. This adjustable-width stand features five castors. Note that this item will take two to four weeks to ship.

Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months.