I-90 Corridor Sno-Parks.
The Sno-Park Program is managed by State Parks, and is funded solely by the sale of Sno-Park permits.
Each Sno-Park page (pull down menu) lists what pass is required for that particular Sno-Park. Yes, all the various passes required gets confusing. We know.
If you can't stop at your local winter recreation shop, you will still be able to purchase permits at the following places up on Snoqualmie Pass:
Old USFS Visitor Center (now Summit at Snoqualmie Security) located by Summit West on SR 903. There is a ticket spitter out front.
Hyak Sno-Park credit card kiosk (located by restrooms) 7 days a week for day permits
Hyak Sno-Park on weekends in person.
map on left is old, but still usable.
Download map above if you like, but it does need some updates. It summarizes each Sno-Park in the Snoqualmie Pass corridor. This map is a "geopdf" and can be used in your iPhone or Android with the app called "Avenza Maps" by Avenza and have GPS capabilities.
Please note that Price Creek Westbound is closed forever. It is becoming a wildlife over pass.