Used car seats-WWYD?

TinaL99

I'm just thinking ahead.  We will eventually need 2 convertible car seats for Audrey, 3 if we buy one for MILs car since she is our PT day care provider.  The plan is to buy them during the next BRU trade-in sale.  

The infant seat that we used for Stella in the truck has since expired (it was given to us by a trusted friend) so that will go toward the discount on 1 car seat.  The infant seat we are using now goes with our Graco travel system.  I thought about selling the travel system on Craigslist when we're done with the infant seat since we have a double stroller now but I feel weird about selling a used car seat.  Now I'm thinking I will just use it toward a 2nd convertible car seat and just sell the stroller by itself.  WWYD?