I have been subtly suggesting to ALL the encoder makers for a couple years now that they should send stock to Bob Roberts. Mamers order a lot from Bob, and whoever ends up distributing through Bob is going to win the encoder war!
Fact is, neither ultimarc nor groovygamegear has anything that I want other than encoders. Because of this I often just hack gamepads or keyboards for simpler projects, simply because I don't want to make a separate order (and pay separate shipping) for one item.
But, Bob Roberts ALWAYS has stuff I want. If Bob had someones encoder I would have used one on every single project I have ever done, because there is always something I need to order from Bob.
Now, as far as deliveries go. I always get everything delivered to me at work. There is always someone at work, so there is never going to be a missing package, oops didn't hear the doorbell, or couldn't find your apartment, type of problem.
If you simply don't work someplace where you could get deliveries, then see if you have a friend or family member who does. If those are still no dice, then elderly relatives are a good bet, as they are almost always home, and are going to be happy to see you, even if it is just because you are picking up a package.