Unable to add old **bleep** packs to the bundle (Brazil)

zzlorax​  It used to take a few months to add new packs to the bundling feature.  Now it takes a lot longer, as EA adds most of the newest packs at once up to two years after the oldest one's release.  This isn't an issue of where you live, it's something on EA's end that's not being handled the way it was years ago.

You can keep an eye on this thread for updates to the bundling tool:

[FAQ] Sims 4 Buy a Bundle: Windows and macOS | EA Forums - 8685461

I try to keep it current, although I own most of the new content and therefore rely on others to let me know when something changes.

As for why newer packs are more expensive than older ones, that seems to be the case in several countries.  I don't know whether it's about the exchange rates or something else, as I haven't seen any official statements from EA, but you're not alone there either.