Like it has been said above the one from Walmart works really good for the money spent.

As for feeders I built one last week out of a 55 gallon drum.
I just went to Walmart and brought what I needed ie the leg brackets,spinner and solar charger.

You dont have to get the spinner I did but I wanted it to go off at the time I pick.
Walmart have a dawn/dusk spinner that here sells for $24 the leg brackets are $19 the drum was $13 solar charger $12 and battery was $10 I already had the pipe for the legs laying around but you could get those for about $20 for the 3 needed.

It only took me 30 minutes to put it all together.

The 55 gallon drum holds 440 pounds of corn and if you spin out 2 pounds in the morning and again in the afternoon you will get 110 days out of a full drum.

Hope this helps.