I keep reading about these "Olive" tips from shure that are compatible with Westone 3's.  Every link I click leads to a dead end and I can't find them online.  I don't feel like the seal is good enough for my ears with the included tips, and I would like to try these Olives.

I've just ordered the Westone 3 earbuds which should be here in a few days.  I'm new to this area but did some research on a variety of headphones.  Would you recommend a portable amp?   If so, which one?

Snipped