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Dick Horstman has the best quality partridge rocks you can find. If you can afford them, they are $6/chick for a minimum of 10 chicks, plus shipping from Pennsylvania. I'll let the others speak for themselves, but some of the members on this thread may be willing to send you chicks or eggs.
If you look at the very last picture on page 23, you'll notice that hen has two clearly defined black "chevrons" on each feather, whereas in the picture of my Meyer PR on page 24, some feathers lack the second chevron or have different shapes. They are also not as clearly defined and the color contrast is not as striking. I'm not familiar with the exact standard since I've not seen the book (someone mentioned it's copyrighted and not available on the internet), but those are things that stand out to me as quality issues for coloring. Being sexed pullets from Meyer, I'm sure they are bred primarily for production.
Not knowing where Mt Healthy & Privett source their birds (someone on this forum might, though, and several of the hatcheries actually have an account here), it's a toss up what you'll get. I'd be inclined to agree if someone told me that smaller hatcheries are able to have better breeding stock because they have less demand and therefore more flexibility toward quality, but I have no direct experience with that.
You might want to put out feelers on the "Chicken Breeders & Hatcheries" section and see if you can get responses from any of the hatchery folks regarding the quality or sourcing of their stock.