Oh, yeah, I forgot, and Welcome To The Club! You know, finding parts! Part of the hobby! I bet it doesn't keep us on our...toes?! By the way, both watches are very nice. Congratulations on a great start!
We have a section listing suppliers from all over, so feel free to check them all out or contribute with new ones.
A mat is very helpful but sometimes it is not enough, good tweezers -- and well maintained -- are your first line of defense against running away parts.