The problem with phesant hunting in SD is that it's "almost" all farmed out.
Every farmer who has some decent hunting land has become a "hunting guide".
You won't find any "free" opening day hunting in SD unless you own the land, are a relative or a connected local. Opening day in SD is booked a year in advance.
However, if you go in mid November, after the rush, you can find some decent hunting without spending your children's inheritance.. but you had better be prepared to party down with the locals...
Once again.. I recommend Miller SD.. dead nuts in the middle of the best phesant hunting in the world.
I suggest you contact the Dew Drop Inn in Miller, make a mid November reservation and tell them you would like to make some hunting contacts but that you would like to avoid the expensive outfitters.
Next Stop.. Turtle Creek Saloon in Miller. Stop in at noon the first day you arrive, eat lunch and start asking around for places to hunt that are affordable. Be friendly and you're in. Being a nice guy is a good thing in SD, they all like nice people. Also.. troll the other 3 bars in Miller, if they are open. Yep.. a town of 1200 people has 4 bars when hunting is in full swing... Bars are the best places to make hunting contacts in South Dakota.
Always go out with a local who has permission to hunt the land and and never go out on your own because you "will" get busted for trespassing. Since Pheasant hunting has become an industry out there most of the farmers and ranchers are very protective of their birds.