Hello Paul,
Sure lots to chose from regarding retailers, kind of overwhelming.
I took a break like you from the hobby and got going a couple of years
back.
I use a on-line retail group at
http://stamps2go.com/default.aspx. You can pick and chose and most prices seem pretty fair to me, everything from a penny to thousands. Easy site to browse around and use for reference on pricing and purchase.
Welcome back to the hobby.
Chuck]