Hi,
clic on the link below and follow my description
Map 5 Orobas Fjords Warning : possible spoilers ! If you want find it for yourself, just only read first part of this post and not opening the spoilertag!
When you teleport to the King Scrine (nr 2 on the map), jump and transform in dragonform. then fly to nr 4 (Simeon) where you can also find a teleporter that bring to to nr 8 (Beird & Abram - 2 trader's). Going up the ladder and after that you must fight 2 people first (John & Kara).
After that you can find in that bunker a way to clear up some of the anti dragon shields !
Flying to nr 10 (Dragon Cliff Castle) you can find another trader : Artemas. There you don't have to fight before you can trade with Artemas (but I don't remember you can fly to nr 10 BEFORE clearing up the anti dragon shields .... but you can give it a try of course

...
2 good trader's you can find in Aleroth (Zarniyar, Pilcher & Mercator - the last one is only for herbs if you want some ...). You can only go to Aleroth if you first find 3 different kind of Zeppelin parts spread in Wyvren nests in the Oroabas Fjords. You've only to kill some flying enemies to the way to 5.5 - 5.8 (see map 5) and search all the nests for Zeppelin parts (Rudder, Kompas and something else - 3 different kind of items). After that you must find a way to go to High Hall where there is a teleporter that can bring you to another teleporter whit the name Camp Harbour .
In Camp Harbour you can find also 2 trader's (Leon & Irwin) (and you don't have to fight, but just flying to teleporter nr 12 (Camp overlook). If I'm right this teleporter can bring you to High Hall teleporter and the High Hall teleporter can bring you to Camp Harbour !
After soem search and fighting in dragonform you will find a cave nearby a blue teleporter at the Red Hammer Tribe. In that Cave you can find Timpuk, another nice trader !!!
What I did : I making a drawing of all the blue telporters (and also the teleporter scrines incluse) and draw all possible travelroutes per teleporter via arrows ... you will see that a few teleporters are brocken and have just 1 travelroute ... other ones you can change their destiny .
This a a real time saver after making the effort to put this fast travel info on a piece of paper
Good luck !