I found this adorable 1940s-50s high chair in the thrift store the other day for about $15, and I couldn't believe it! I've seen similar ones online going for $200+, so I had to get it.
You do have to be careful with older high chairs, since most of them do not meet the safety requirements for today, but it is possible to modify them so they meet the standards. For anyone who is interested, you can check those out here.