Introductions discussion

Greetings everyone. I am an 18-year-old with a keen interest in chastity. I will be leaving my parents’ home this October to study at a university in the countryside, and I believe it is the perfect moment to purchase my first device to join your community. Naturally, I want to research before buying and chat with someone who has already made the transition. Since I am not working yet, I have no income, so I need an affordable option for my debut (ideally 50-70 euros including shipping). It does not need to be ultra-secure since I will self-lock; just a small, inexpensive device to get used to the sensation of having plastic or metal around your penis and testicles is different from simply abstaining. I would appreciate advice on taking proper measurements and choosing a device that fits those numbers. Many websites use inches which confuses me, and their measurement guides can be complicated. If you have a budget-friendly recommendation (within my price range), please let me know. Thank you beforehand NtC96