You can also buy a lot of ship shards in the Galactic War store. There are a few good toons in that store, but a few that aren't very valuable, so you can use your currency to buy ship shards instead.
Zeb, Cad Bane (now), Biggs are the best characters to farm in that store.
IG-86 is good if you have Droids, Resistance Pilot is good if you run zFinn, Phasma is good for First Order, and MagmaTrooper is fairly useful.
I'd rank Bodhi, K2SO, Lumi, NS Initiate, Teebo, Dathcha, Poggle, and Tusken Raider as less valuable than the ships that rotate in that store. I forget all the ships, but I think Geonosians and Rebels show up there pretty frequently.
