These mineral feeders are easy to make out of 4 inch PVC piping material. They will hold up for years.
1 foot section of 4 inch pvc piping
45º angle for the bottom
2 end cap adaptors for the screw on caps
2 screw on end caps
Place the 45ºangle on the end of the tubing and screw the end cap onto the bottom of that. Do not glue it because you may eventually need to clean the bottom out and you can screw it right off.
Then put a screw on adaptor and cap on the top.
Attach the feeders inside the stalls or someplace where rain cannot get in them. Put them low enough that all the goats can reach them but try not to put them so low that they put their feet in them. Occasionally I have to scoop nannyberries out of mine, but not often. Fill them as needed.