Not sure if some mentioned Sierra Trading Post. I buy my Costa's there and have always paid right around $50.00 for them.
Sign up for email and get a discount flyer, they always are having a sale and free shipping etc.
The MN DNR website shows the Big Fork just opening up upstream and the Little Fork open for about half of it's length upstream. Flows are high but have been higher in past years so may not be high enough to cause problems. I would think within 4 -5 days one will be able to tell how severe the spring rise in the Forks will be. If the upstream gages begin to drop soon it will be a good sign as it will indicate the big push from upstream is past.