Import taxes have always been bad, but the situation's grown far, far worse than ever before due to the country's free-falling economy. A dollar used to cost R$2.50 not too many years ago, now it's close to R$6 and constantly going up. And up... and up...
As a quick example, I bought a GTX 1060 about two years ago, for a then hefty price of R$1300. I can't find that model for sale now, but I do see the 1050 Ti, an inferior model, for R$1700. So it's considerably more expensive than a superior GPU bought two years ago. The prices of these things tend to go down over time, as with most technology, which only goes to show how far our economy's gone to shit.
Of course, it was always gonna go to shit, that was quite predictable when the people decided to elect a completely ignorant retard as president.
That aside, GPU prices seem to have exploded worldwide, so it may be easier to gauge your situation using the example of a different product.
The RTX 3060 and 3060 Ti have an MSRP of $329 and $399. But this is what they were sold for at launch.
That's higher than the MSRP for the much more powerful RTX 3080. ($699)
And these all sell out in seconds.