The pre-sale of Crypto 3.0 lasted only a few moments on the 21st of May. It was impossible to order, there was a strong adherence or only some postage stamps were made available.!?

This scheme leads to speculation, people will wait for the 21st of June, thinking that it will be difficult to buy, for those who live outside Austria, so the site will be red hot and be out of service.
I wouldn't worry about the regular sale on June 21. I doubt the stamps will sell out on the first day let alone the first week. If you look at the German-speaking community, it quickly becomes clear that many users have lost interest in the Austrian crypto stamps. Last year's CS2 was quite a disaster and scared away many potential buyers. You only have to take a closer look at the relevant Telegram groups: moderate interest in the CS3? Yes. Hype? Not at all!
I've spoken with several users who have purchased more than 100 stamps each in the last year. None of them will buy similar quantities this year.