A "good price" is whatever you are willing to pay.
I imagine it's hard to get birds in South Dakota, so a "good price" there could easily be higher than, for instance, Tennessee. OTOH, white seems to be a common color in araucanas (I produce way too many whites myself), so that might keep the price down a bit. OTOH, there may be a bunch of people at the auction who don't know anything about araucanas who bid the price way up. There's really no way to predict.
Don't get into the breed with any expectation of making money from them. They are very frustrating to breed. They tend to have low fertility, and you've got to get a lot of slippery traits together (tufts, rumplessness, leg color, feather color, body shape, comb shape, etc.) before you can claim to have a show quality bird.
If you just love the birds, then bid whatever you yourself feel comfortable with. But if you want a profitable enterprise, then save your money and let somebody else buy them!