If you only want a few, then Mouser is a pretty good way to go. My bro was getting into mech boards but he wanted to try some of the switches first, so he bought 2 blues, clears, and blacks. He would have purchased more variety, but they were not available. Using these switches, you can do some of the ghetto mods alright. The blue springs can be used to try ghetto reds and ghetto browns with the stems from black and clear switches.
Granted, the stems from clears and browns are different enough that the clear stem with a blue spring is not a very good analog for browns, but it is fun to try.