I've never bought any but a google search for 'games components' came back with these...

http://www.grandprixintl.com/misc/card_stands.html

http://www.dice.co.uk/gamcom_re.htm

http://www.plasticsforgames.co.uk/en/en ... stands.asp

I may be wrong, but the last one looks like one that got recommended on another forum I was on for a different part...

I maybe wrong but these particular sites seem to be for large orders. I think they're selling to people who are manufacturing board games, not really for an individual customer.

You might want to double check me though, I was just browsing quickly.

Just scroll down.
They even do some clear ones, that I own and are very cool.

Sorry Google prioritises uk websites for me - I'm sure there's some way to turn it off, but I like it for the most part.