Watch out for thrift shops car seats you should buy new (if you know the person giving it to you and hasn't expire fine- other wise you don't know if its been in accident or not. Strollers you can sometimes find in consignment shops but be prepared to search and see if there are any recalls, etc. A friend of mine suggested, checking consignment shops in the wealthier towns, better quality stuff and often times it has been taken care of. Craigslist is another option.
Sorry can't recommend anything, but thankfully we are having a singleton (we a bit of a twin scare, due to ivf, but was so happy when they only found one). I'm going for a britax b-agile stroller and carseat that fits it.
Twins was a shock for me lol. I wanted 2 more kids just get 2 in one shot. Done deal lol. I will look into it. But I'm pretty set on getting a new one for the kids. New babies need new stroller and car seats. Just can't believe they cost so much! Thanks for their tips. Will def. Look into it.