RE: Cheap scent idea...
AJ52 offered a good idea, if it can cover your sent and still get animals to literally follow you, I would say thatsa winner and will infact try in out this season.
I suppose the ammonia would work, but it would be unpleasant for the deer as straight ammonia is extemely strong and dosn't share the cemmical make up of deer uraine, the make up which other deer would find inviting. But, I think I would cover your sent.
Good luck!
KEEP HUNTING THE GREAT OUTDOORS & GOD ALIVE, PASS IT ON!