I think you did pretty well. I'd have bought the X-wing Luke and IG-88 for those prices

Those are amazing deals.
The others are pretty decent. Vader/Maul are good deals. I've seen better for Vader (I got it for under $30 shipped but that was when the big glut was on) , but Maul is holding well so that's decent. I'm still trying to get it for under $40 shipped.
Leia and Lando I haven't been following, but geez, you're getting them shipped for about what the cheapest places have them for as pre-sales before shipping is added, so I don't think you can complain about that. Nick might do better with his comic shop but I can't (my guy charges $55 per bust plus taxes

- Cdn dollars though and it's reasonable, but I can beat it).
Good price too on Han/Yoda too but I think those guys show why they go more often with army builders - they sell better than OT characters. Kind of a weird trend from my perspective, OT outperformed by PT, but then you have to factor in issue size. Han too suffers from having a Stormtrooper version out there to compete with as well.
Overall, nice work.