level 16 taulin city - there are several markets there
the sunstorm arc blueprint is in ZEDs (?) merch
somewhere about the 1:00 edge on the city map - look for 3 dot/square with the guy standing out front
easiest way to get there:
character --> config ... at the bottom is the option transport back to taulin wastelands(radlands?) something - click that
then click world, and the option of taulin city is there
***i'm 95% sure it's in ZEDs merch
in the official guide, areas - taulin city, hovering your mouse around the edges pops up shop names...there are shopkeepers standing outside their shops - look for the 3 squares