The offers I mentioned are only on the website. And you go an S23 as a bday gift? Or you got it for someone else’s bday? If someone gifted it to you, why do you want to return it and downgrade phones?

If you have a phone to trade in and if you qualify for any offer programs (military, student, etc) then the S23/S23+ can be within $400-500. I traded in an iPhone 12 Pro($400 trade in) and got a student discount($150 discount) so I paid just under $480 (about 438.34€) after tax for the S23+

S3