Switching from Verizon w/3 lines and 2 ipads

Paying $218 per month for 3 phone and 2 tablet lines (excluding add-ons like mobile protect and one device that i owe $500 on). VZ's network is so so where I live/work and my friend who has Tmobile often has a signal when I don't (rarely does he not have a good connection). Planning to move to Experience Beyond 2.0 at $170 for 3 lines and $5 for each tablet. Would get a $1,000 trade in credit each on the 2 phone lines adding $13.89 to the $170 plus the Protection 360. Not seeing any deals for iPad Air from Tmobile other than a trade in credit which is the same as Apples. Planning to go to Costco to make the change to get the added credit. Looking for any insight that I may have missed? Any Tmobile discounts (excluding trade in) for iPads that Im missing?