If you are on Facebook and you have items to sell or are looking for things to buy second hand locally then you might like to join the Facebook group
Milton Buy & Sell (Cambridge, UK). It currently has 162 members so there’s lots of being posted on there, especially child related things but also other items such as eggs and Ikea furniture.

It’s a closed group to deter spammers but Paula Maplesden, who manages the group, welcomes anyone from Milton who wants to join and there has been a bit of a rush in the last forty eight hours since it was mentioned in a thread on the milton-chat mailing list so that should mean even more goodies to buy.