Best way to purchase Galaxy S 22

I was planning to upgrade my 4+ year old phone.  I was looking at the S Ultra. There are quite a number of pre-booking offers, some of which can be combined. Would anyone have recommendations on the best way to reap Max benefits, in detail (I can see the offers on Amazon and Samsung shop, but a combinaion, Samsung store, referral…some benefits like that). Will appreciate it, thanks.