does anyone know were to buy the special brasilian “batida ovos de codorna”?

It must be available in region around Sao Paulo and the states Parana and Sta. Katherina

great topic, and great tipps!
The variety of drinks in Brazil is so huge and, as you already mention, often regionally influenced, that I would like to add some favourites especially from Salvador, Bahia:

1. -Roscas.
Basically the same you described as Batidas, but with vodka instead of Cachaça. Apart from Caipirosca (with lime) the most popular flavours are strawberry, kiwi and pineapple.

2. Batidas (in Bahia)
what you described as Batida, Bahians call “-rinha”, as in Caipirinha. But Bahians are also fans of your “number 4. – Cachaça Pura”. You can get cachaça in various flavours of fruits or herbs, and creamy ones like coconut and chocolate. The creamy cachaças are the “Batidas” in Bahian bars.

3. Speaking of creamy drinks:
If Cachaça or vodca with sugar and crushed ice is a mixture which blends well with all kinds of fruit, why should it not do so with other sweet things as well?
This question may have inspired Bahian creativity to invent drinks like Capeta (with chocolate and guaraná powder) and Nevada – one of my favourites. The latter one is with Leite Condensado (condensed milk), which mixed with the crushed ice becomes creamy like ice cream while being white as snow (hence the name Nevada, from “neve”, Portuguese for snow), and topped with strawberry syrup looks more like a delicious desert than a drink.

4., 5., 6. … I did mention Bahian creativity before, didn’t I?
One thing is for sure: people in Bahia are not afraid to try to mix anything with alcohol to see if it tastes good. Every year, barkeepers invent countless new drinks, and their names are usually as creative as the mixtures themselves. Carnival is probably the time when most new drinks are “born”.

My final tipp on this topic: when you get to a Bahian bar or party, don’t be shy, just try whatever drink sounds tasty.