I’ve bought pieces from many places. I’m based in the US and I’ve bought pieces from Russia, Finland, Denmark, Germany, England, Brazil (where you’re looking), and several others. I typically buy them based on cost or bulk ordering, since plenty of stores State side didn’t have all the parts I needed and buying a bunch of mini-carts was not cost effective. Shipping will be more expensive from out of country places, so if you have a small order imagine the shipping will likely be double that.
However, do be very careful of where you’re ordering parts from currently. Because of the pandemic, shipping costs from European and Asian regions have increased significantly. They’ve got shipping limits that now require them to mail using more expensive rates. So definitely look into the shipping policy of the stores. Since you’re looking at same continent, I don’t think it should be that bad, but I also haven’t looked at any of the stores down there recently.
Edit: Oh right, how many so it’s worth it. That depends more on budget than the value of pieces. If you don’t have the budget to afford extra pieces plus the shipping, then it doesn’t matter. But otherwise, better to play by how you feel. Everyone has difference tolerance levels on spending and I’ve never quite had a consistency on it.