Is the OP updated with your stock? A little confused.
Yep..

I send you 200g of Negro candies for 0.1 BTC.
Currently, I have the following bags on stock:
Classic: 1 x 100g
So you only have 100g of classic in stock?
Yes, currently I only have 100g of the classic, but you can order any bags anyway, just that it might take some extra time to get. But it only really matters regarding the rarer flavors - 200g & 100g classics are sold everywhere, even in the little grocery store across the street.

However, black-currant (feketeribizli) and honey-menthol (méz-mentol) are relatively rare, and probably I'd need to go to a big supermarket to get them, and even then it's not sure I actually find some - and I go to supermarkets quite rarely.
Meaning we have to get classic + one of the "rip off" flavors?
As above, you don't have to - if you order one that I don't have at the moment, I'll get it for you.

So if you'd like to have 200g of classic, I'll certainly buy it for you quickly! On the other hand, I actually encourage people to try 2 flavors at once. For example, black-currant and honey are sweet, unlike the other menthol flavors, I suggest to get one of them for a classic.
And I know this is probably a lost cause for my purposes, but what are the estimated shipping times to someone in the US?
2-4 weeks usually.