In the next few weeks, make sure to watch my sidebar, if you don't already subscribe to Astrid Volquardsen's and Loriann Signori's blogs. They have traveled from afar to enjoy the plein air painting in Washington, and will be taking Richard McKinley's workshop and posting wonderful new things.
I have been asked about the palette that I use: the nuances and secrets that are just mine.
Ever shoot a shotgun? That describes the pattern of buy, use, buy some more and then have too many doubles and go out and buy some more. It is a scattered approach. I have shopped for pastels at specialty art retailers, from catalogs, off of eBay and from unusual places, such as stationary stores. You would do well to look at your needs first, and then collect in a more goal oriented manner.
Here are some practices that pastelists follow in collecting their palette of sticks.
Collect by brand.
If you fall in love, or even like, with a particular brand, then you may acquire their color chart and begin collecting several sticks within the brand. This is a safe choice, because the manufacturers consider the whole range of colors and values that are possible and profitable for them to make. Dakota Pastels sells hand made color charts, which is a great investment when you are interested in a given brand and want to have a lot of them without too many duplicates, or want to be able to replace sticks within the line, and need to identify a color that has lost its label.
Collect by color wheel.
Kitty Wallis once had me make a color wheel with my sticks, and then it was easier to identify the holes in my collection. Do this to find out what you need to have a full range of hues. What you need to do is arrange each hue also by value in order to cover the scale of darks to lights.
Collect by trial and error.
See the above comment on shotguns. One guaranteed way to find yourself with doubles and to get lost organizationally is to buy sets that manufacturers label as "Landscape" or "Southwest Landscape" or "Portrait" sets. Buying any two of these sets almost guarantees you'll double up in some colors.
Collect by filling in the gaps.
As with the color wheel method, one can systematically buy either open stock, or well identified sets that cover a range within one hue. A good example is the Diane Townsend sets of blues. Another way to buy to fill-in your needs is to get sets of very darks, or tinted grays. You are less likely to double-up within a brand, but you will have more of one color from different sets. That is a good thing, since each brand behaves in unique ways - one more abrasive than another, one softer than the other, etc.
Buy the whole set.
This is the rich man's method of collecting pastels, because complete sets can run an artist around $1,500-$2,000.
It is a yummy and rewarding way to establish a big collection, though. Not to mention that the boxes may help with storage and organization. I like to put all of my pastels in one big studio tray, which I made myself, so that my palette is organized my way, rather than the manufacturer's way. Figuring out what makes a manufacturer organize their pastels in a particular way requires degrees in chemistry and engineering. Don't even try if that's not you.
Collect by market suggestion.
No explanation required. We are all subject to the forces of the marketplace. Your best defense is to try pastels a few at a time before you buy deep in a brand.
Open Stock.
This is the method of choice for the well organized professional, who knows what he wants to fulfill his set, or who needs to replace sticks or improve his palette.
Sets.
As mentioned above, I prefer no-nonsense sets organized around a hue or around a value set. Blues, greens, grays, darks and such. Dine Townsend does a fine job of this.