Hand me downs

Meli • Engaged. 25 with a 7yo Daughter. Baby boy born Oct 17th, Napa CA
So my SIL just had a baby last year. Such a cute bouncing baby boy! And my fiancé and I are due in October, this is my second child my first born is 7 years old & she's praying for a little brother lol. Anyway. I know she'll offer her sons things but I think the only furniture/toys he'll be done with is his swing & his infant car seat. My SO and I agreed we'll need two car seats so we won't have to keep switching the base of the seat from car to car. What hand me downs have any of you moms recieved or excepted I should say that you were grateful you didn't have to buy brand new?