Amazon has the Mind Reader Mobile Sit & Stand Workstation Desk (Black or White, Large, SDROLL-BLK) for $33 with free shipping. List price: $80. Features adjustable height, 4 locking wheels. Fits perfectly in any workspace and allows you to store Monitors, Computers, Office Supplies, and more.
Has good Amazon Reviews.
Amazon has the Acme Furniture Bliss Manual Sit / Stand Desk (White Marble) for $202 with free shipping. List price: $423. Features powder-coated metal base, cable passthrough, manual crank lift, wood desk top. It measures 48" L x 24" W.
Has excellent Amazon Reviews.