I use
ebay and it's competitors or perhaps fellow stamp emporiums, as I like to think of them, and have always been happy at how easy it is to access items.
I like the happy smiley face stamped on the bottom of the invoice. I used to put a smiley face sticker on the back of my envelopes sent to buyers.
I wish I could figure out how to sell cheap stamps on
ebay and to scan them quickly or take a digital pic quickly. If someone could figure that out the online stamp community would grow quite a bit I think.