Hello there,
Could you explain more about the project please? I assume you need these phones for the advantages of the new registered Azure account.
I currently have 2 numbers, and probably I can make it 6 or 7. If you'd like to buy a new phone number, it's price is around 75-85 TRY (~15 USD) among the operators. After a research, Turkcell also have this new promotion. I can contact them and see if it continues for you.
By using my own numbers, or by using new ones, I'd love to help you on this project either way. If you have more questions, I can happily answer whether you're planning to work with me or not. Looking forward to hear back from you.
Have a great day, Uğur.