Welcome to ATP Aiswarya!
I almost always buy seeds online, unless I see a display in a store and give in to temptation. I often buy from "Seeds of Italy", which is the USA distributor for Franchi Seeds. I know they also have a Canadian distributor. maybe if you Google "Franchi Sementi" FROM Austria, the Austrian distributor will come up.
http://www.franchisementi.it/
I think of Franchi as "gourmet seeds". They have so many kinds of broccoli that the "ordinary" ones are in the minority.
I don't see any other ATP members who listed their home address as Austria:
User Location Miles away
bamira Czech Republic 172
sempervivumde Germany, Bavarian, Ratisbona 199
xeronema Padova 236
terekicsaba Budapest, Hungary 311
laszloszakszon Budapest, Hungary 311
jagoston Hungary 344
ninell Hungary 344
pasla3 BYTOM /POLAND/ 360
Anja Germany 380
When I Google "buy seeds Austria", I only find Cannabis seed stores!!
Hopefully when you Goggle locally, the search won't be as strange.
The only other suggestion I have is "Amazon", and if that is still USA-based, the shipping charges would be awful.
Maybe
@bamira has suggestions about
>> "good quality Broccoli seeds
for sprouting at reasonable rates in Vienna, Austria".