Workstream by Monoprice Ultra-Slim Height Adjustable Sit-Stand Table Desk Converter, Premium Aluminum
This is the lowest price I have seen on this. I bought one last year when it was $89.99 and feel that that was a great deal. Much cheaper now. $89.99 is the usual price, don't believe the $129.99 list price. There is a shipping charge, but should be reasonable as I think they have distribution centers around the country. Mine was around $10 shipping.
Monoprice site wide coupons are becoming rarer so grab it now while on sale.