Are you looking to find Thick Timber Logs to make a hole in to hold Christmas trees, or are you looking for metal or plastic ones that can be taken apart?
Logs - try a wood yard. Ones that come apart - try Christmas stores! Hope that helps.......
Are you talking about the game pieces??? here's one site but it's from 2015 so it's an old threrad https://forums.funplusgame.com/forum/family-farm-seaside/english-family-farm-seaside/game-tips/325707-stack-decorations-guide-update-bird-home-base-xmas-tree cannot find anything recent just online game apps
If you mean the "X" bases for Christmas trees, these are simply made by firmly nailing two boards together in the form of an X. Also, you can make them with free boards by using pallets. Many retailers give them away or sell them for cheap to get them hauled away. Martha, I hope this is what you needed, I was not exactly sure what you meant to purchase and stack them.