When you look at prices for baby equipment like car seats, pack and play sets, play pens and cribs, many young couples would do almost anything to find the desired items for a cheaper price at a garage sale. But think more than twice before you do this because many items are being placed for sale mindlessly by people interested in freeing up some space in their house. There are many items which have been recalled or are dangerous. Many will come without any instruction book. Many will be partially broken or missing parts. Some items, like bike helmets or car seats are not supposed to be used again after an accident. How would you know from looking at such items? You might not be able to tell at all. If an item has been recalled, the reasons for recalls could relate to death or injury of numerous children. How would you know whether what you are buying is a great find or a death trap for a baby? You could check on your cell phone or computer on the following site: https://www.cpsc.gov/Recalls or similar sites but those sites will only tell you if an item was recalled, NOT if the one you are looking at is missing a critical part.
In conclusion, your child's safety is more important than saving a few bucks. Your smartest move? Don't buy any baby equipment at a garage sale or on Craig's List/Ebay. And if you are running a garage sale, don't put out baby equipment unless you have personally verified that the item has not been recalled, the item is in perfect condition (albeit used) AND that you have the instruction book for the item.