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Hey there! I definitely understand where you're coming from. It does seem like most of the available promotions as of late require a new line or port-in to take advantage. It doesn't happen often, but occasionally there are offers without such requirements. You can check Device deals for information.
As of right now, the only offer that does not demand a new line or port is an LG G7 or V30, get up to $750 back in account credits when you purchase a second qualifying LG device. Buy LG G7 and save up to $750 on select second LG phones I know you're more keen on a Samsung device, but those promos almost always need a new line.
I have been a tmobile customer for 16 years... they stopped giving current customers discounts long ago. I don't need another line so I never qualify to get a bogo deal. Shameful.