There is a free cycle in a lot of towns in England. We have one in Louth, Lincolnshire, which is a very small place. Here are my suggestions for cheap materials, and I have used them all. Local paper classified columns. A few weeks ago a lady was selling a chicken house and five hens for £50! Postcard adverts in shop windows, got 14 wooden tea chests for £15, ideal for turning into small animal houses etc. Skips outside buildings being renovated. Often builders are pleased to offload items from the skips, a very good source of wood! Car boot and garage sales, once again a good source of useful wood, and some great bargains in garden and DIY tools. My daughter got a great ladies bike for £30. Scrap yards will often sell small items very cheap as they really exist to deal in metals and renovation salvage. Hope these suggestions help you.