1) Visit the smaller grocery stores, on them you will find a telephone number, call the number.
2) drive down street 1 or 2 at industrial area, you should look for ABA (Ali Bin Ali) and Almana (Coca Cola) they will or should have used units. Either they can sell it to you or advise where to get a used one. They may not sell theirs as it would have their branding.
All the best.