One of the good things about Montenegro is that you still have many craftsmen around, so you could find a carpenter to do just that for you at a good price. It might not be so cheap as Ikea's catalog prices, but it could be the same as the Ikea+60% - Ask around you for a carpenter ("Stolar"). Print a photo with dimensions of what you need, and get a quote ("Ponuda")!
If you can't find in Petrovac / Budva area, I can give you contacts in the Tivat area.