Blue Drakes appear in the skies over Stormwind or Orgrimmar when a player earns Dragonwrath, Tarecgosa's Rest.
Here you can buy Blue Drake for EU or US Servers.
You'll get guide for getting Blue Drake
You'll be able to get Blue Drake mount
Additional budget for Character transfer or Character boost to max level. BMAH Services in Shadowlands now requirement to have a max level character on server, so Trial character will not work.
Free time on evening, if you choose selfplay option