adamo return policy

Looks like their only dealers nearby to you are in Fargo, Grand Forks, and Aberdeen, so not close.  Their return policy is at http://www.store.ismseat.com/termsandconditions.sc;jsessionid=BE4DED1F6547E08B1D44F6DAC2A8A370.m1plqscsfapp03.  I actually expected better of them.  

You might be better off ordering from:

TriVillage (45 day guarantee http://www.trivillage.com/our-guarantee.html)

OneTri (60 days https://www.onetri.com/returns.html)  I had a really good experience with them; I ordered someBonk Breakers, and they emailed me that they didn't have the right quantities in the different flavors I had ordered, so I just took almost all that they had, and I think they threw in the 2 or 3 they had left in stock in the box.  Really nice people, and quick to respond.

Nytro (30 days, but I would clarify with them, since they exclude "saddles that have been ridden" http://www.nytro.com/info/return-policy)

There's always Amazon.com too - just check to make sure it's from Amazon.com directly, and not a third party "fulfilled by Amazon" seller.

Performance Bike often has cheaper saddles and a great return policy - but they don't stock ISM saddles.  Their http://www.performancebike.com/bikes/Product_10052_10551_1166782_-1_400196__400196 seems like it might work, and at $40, isn't a big risk.  Buy a couple of tubes and you'll get to the "free shipping" level.

I ride a Prologue, and there's no noticeable wear on either of them despite well over a thousand miles on each.  My white one does have some grease marks that I have to scrub a bit, but that's because it's white.  It also fixed some numbness issues I was having related to compressed blood vessels near my prostate.  However, my wife tried one and hated it.  

You can also try contacting random shops to see if they will work with you on a personal level.  A few years ago, Slowtwitch ran a "Saddle Tour" demo thing at some major shops.  None of them are near Bismark, but you might be able to call them and work something out. 

Buying a used saddle (check classifieds here and on Slowtwitch) can save you money, albeit the return policy is probably non-existant - but you could offer someone on Classifieds something like $10 extra for the option to send it back within 30 days.  I'd probably take that if I had one to sell.

I am still actually disappointed by ISM's stated return policy.  So, in your situation, you might be better off talking to the folks at Cobb Cycling (http://www.cobbcycling.com/content/warranty), who make similar split-nose saddles.  My wife rides a Cobb V Flow Plus and it's been a great option for her.

I also wrote a fair bit about saddles here:  http://www.beginnertriathlete.com/discussion/forums/thread-view.asp?tid=527147&page=32 about how saddles should fit and other issues that can contribute to saddle problems.