I do not know why this doesn't come up in any google searches for guides but this needs to be said. Everyone says the best ways are "do strike missions for eternal ice shards, buy 5 a day from dragonfall, do hearts, etc." I am here to tell you that these people are all wrong, well intentioned but wrong. These ways may be fastest for farming currency in the long run but for the skyscale there is a better way.
You probably are like me and havent done much in LW4 since you just started skyscale. You will eventually need 250 of each LW4 map currencies for the saddle. Do the following.
In achievements, look up "Return to Thunderhead Peak" and track it. If you complete this achievement to tier 3 (75% done) you get 250 of the map currency. Repeat for Jahai Bluffs, Domain of Istan, Dragon Fall, etc.)
Literally got 250 of each resource in like an hour and a half in one sitting. you get 3 completion points in each zone just by harvesting wood, ore and herbs. This is by far, the fastest and easiest way to get skyscale currencies for saddle.
This has been a PSA from a fresh noob who barely found this out in time to save me from buying icebrood saga in order to get skyscale.