All I can say is that the shops in MA and CT you dealt with must be really nice guys.
The laws and the shipping companies essentially work together to make it expensive. Generally speaking, you cannot use the US Post office unless you are an FFL (there are specific exceptions, but do not apply to your case).
Private shipping companies generally require "next day" shipping, at premium rates for firearms. There may be exceptions, but you'll have to find them.
Fed law requires FFL to FFL if the transfer crosses state lines.
$40 for a transfer fee is high, at this time, for the area. Although, like everything else, the usual cost ($15-25) has been creeping up lately.
I have heard of dealers back east (certain places) charging as much as $100 for a transfer fee, which they can do because essentially, in their location they have a lock on the market.
11 years ago, I had to ship 3 pistols from New York to WA. My father had passed away, and I was sending his pistols to their new home in WA. It was an eye opening experience for me. In the 70s, when I lived in NY (upstate, rural) you almost couldn't "swing a dead cat" without hitting a gunsmith, dealer, or sporting goods store (FFL dealer). I had to drive 80 miles to find an FFL after the funeral, and he charged $25 per gun, PLUS shipping and insurance. The dealer in WA who received them for me didn't charge me anything. he did ask for a beer for his trouble...
I'm sure that if I had to do a similar thing today, the expense would be at least double. (although I can easily manage
two beers...
)
You can thank our elected officials zealotry for keeping us safe for the expense we incur if we want or need to ship a firearm.
If you need to do this again, I would recommend shopping around a bit for an FFL, some will do it much cheaper. Of course, I would also recommend avoiding the whole expense, if practical.
I hope your new job works out well for you, but take some well meant advice from an aging shooter, no matter how well it pays, any job that doesn't give you the time off to drive from Seattle to Spokane and back (one day off) on a regular basis isn't worth keeping in the long run.
The law in WA still allows for instate face to face sale between private individuals. I would have gone that route, maybe even telling the buyer to come to me. Depending on circumstances, of course.
I would also urge you to vote against the WA Background Check initiative when it shows up on the next ballot. Its a poor idea, and written even worse. The proposed law would make common everyday customary behavior such as me visiting you, and you handing me a pistol to examine, a crime, unless we BOTH went to an FFL, you transfer the gun to him, and then he to me, including the background check, first! (and that is only ONE of the situations covered under the proposed law)
BAD LAW! DON'T SUPPORT IT!