An example is chicken feet. Around 300,000 tons of chicken feet are exported from the US mainly China, as a lot of Chinese cuisine has ways to cook these into something tasty. Think about how little chicken feet weigh, and how many make up a ton. That's a lot of feet. Necks too.
The contrast in prices for chicken breast and chicken wings seems most stark. Chicken wings are popular all over the world, but breast mainly in the Anglo world (US, US, AU, CA, NZ) and some of Europe. China doesn't have much frontness for breast. Here, chicken wings retail for 4 times the price of breast (wings about USD6 per kilo and breast USD1.5 per kilo) despite breasts being bone/skin free - commodity, non-brand chicken, a price disparity that is surely a function of cost of arbitrage (shipping and refrigeration). These are retail prices, largely frozen or pre-frozen.
I prefer a free range bird, chicken, duck, pheasant, from the farmyard. As in friend's parent's farm in the countryside. These go at a huge premium to factory stuff, but are also much longer lived and much tastier. Around USD 15-20 per bird depending on size and type.
Edit: Article on chicken and ratio of wing to breast prices http://freakonomics.com/2011/12/09/the-economics-of-chicken-...