Pit Blinds???

Anyone have any suggestions on pit blinds? I have permission on a farm field that is corn silage every year and the geese always use it in mid September to mid October. I think I could get the OK to put a pit blind in.

I've looked on the internet and most pit blinds are quite expensive and from other parts of the country. I'm looking for suggestions that are local and won't break the bank account.

Thanks for your help.