This kind of pricing is quite normal for goods which are not only not Portuguese-made (Spanish is the next cheapest, discounting the far East, generally), but are also not commonly used and therefore bought by any number of Portuguese people/residents. New kitchens have built-in, older ones have simpler standalone units, as a general rule.
Portugal is a small country in relative terms, and when you add transport costs for large, heavy items which don't sell in quantity, lots gets added. And that's before any Brexit or COVID impacts. So the agents here are probably not raking in the 1.5k, or anything like it.
I'm guessing you've found AGABras, the Portuguese national agent:
They are the only authorised agent in Portugal, which is why it's hard to find them elsewhere. Unless you find someone reselling one - which is only likely to be an Expat, I reckon, who may also have paid a lot for it - you may need to just bite the bullet!
It's probably worth checking, whoever you buy from, how the warranty works, and also consider the cost and availability of repairs outside that time. If you're in the Algarve, I'm guessing that company will help. If you're up north, you may find it harder to get parts and service.
Alternatively, check out other options. If size, rather than sleek styling, is the priority, there are quite a lot on the market - avoid the Worten/Radio Popular places, and look for independent or smaller stores. Spain has more options, and many retailers there will deliver here (for a price, which can be reasonable or not, depending on the retailer).
Bear in mind your fuel options. If you're used to mains gas, you may find your location here doesn't have that available, in which case gas comes in bottles, and needs a professional installation if not already present, and if you cook a lot, frequent replacement of bottles. If you have to have a new bottle installation, aim to put the bottles outside, then you can get 45kg Propane cylinders, which last 4 times as long - and you can get setups with 2 bottles with taps to change over, reducing chances of running out.
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