How to buy snow leopard currently?

Hi,

i wanted to update an old leopard mac (which is supported) to mountain lion now that it is out.

Turns out snow leopard cant be bought in the mac store anymore and telephone support says it should be bought at retail sellers.

However i phoned three retailers and none have them in stock anymore.

Is there still a way to buy a Snow Leopard Licence directly or buy a full licence for Montain Lion from Apple?