The problem with buying a workbench and importing it via your courier service is that you're going to "pay through the nose" on account of the weight and taxes if it is valued more than $200.00 Both are deal-breakers.
I have had various carpenters here build all kinds of stuff for me: gabeteras, a lab table, a computer station, a chicken coop! Grab some graph paper and pencils and ruler and design your own, then have a local carpenter build it out of natural pine. You could stain and seal it and it would look real nice. Casters and other accessories you can buy here and just add. Such a build should cost you no more than RD 5,000 including the wood.