Countertop dishwashers cost around PhP20K, depending on the brand. You might want to visit the bigger SM department stores to physically check the “portability”, size, and weight. I think they only carry the Hanabishi brand.

Lazada can have lower prices during the sale season, though, so you might want to consider waiting to get some discount. Lazada has more brand options, too.

As for usefulness, you can’t wash some items with a dishwasher. Some plastics can deform due to the heat. If the detergent is too abrasive, it can ruin non-stick pots and pans. You can’t use Joy. Also, smaller dishwashers can’t accommodate fullsize dinner plates. You also might want to test fit some dishes when you physically check one.