Tyco (Alcoswitch) makes a line of micro switches in SPDT and DPDT thatt are used as dip switches on circuit boards. The SSA12, SSA12G and the SSA22 may work for your application. This is the SSA22 version.
Tyco (Alcoswitch) makes them as well as Grayhill, C&K and Omron to name a few. Your picture is an everyday dip switch. I want to think you are maybe in GB? Hard to suggest a vendor when I don't know your location but I am sure you can locate a distributor for the names I provided. Matter of fact if you work from the link I provided for Alcoswitch you can find them in what you want.
I am sorry. What I want is a SINGLE (not 10, like the pic below) piano dip switch SPST.
**broken link removed**
I am in the UK.
Please consider cost of combined cost and postage as the cost of the item ...ie... buying from digikey would be no good because they would charge me about £8 to get it delivered. Ebay is good because I usually only pay £1 postage. I appreciate I am probably paying more in the long run paying postage per item... rather than bulk buying from digikey... but I am new to all this and buying things as and when I want them is just the way I do it at the minute