In WA, you can get a discounted MSF course thru the state, but the waiting list is long. If you take the MSF course, discounted or not, you have met all the requirements of the state and just take your certificate to the DMV and pay the fee for an endorsement. If you are under 18, you MUST take the MSF course to get an endorsement, over 18, you have the option of the MSF or the cone test at a DMV equipped to license motorcyclists.
I got my first m/c endorsement in CA back in '74 and they used the same cone test then that WA used (and still uses). It's not just a salolom, but also includes left & right circles, accel & braking tests.