Not sure what you mean by "Flavored" wood chunks? I've seen Jack Daniels and Budweiser "flavored" chunks and chips.....
If you are referring to fruit and nut woods, they are natural and not "Flavored". They do not impart a direct flavor from the variety of fruit/nut they are from, but rather the smoke they produce is different in terms of taste than the hickory and mesquite that are so commonly available.
Take for example apple wood chunks; they do not impart an apple flavor, but rather the smoke is lighter and slightly sweeter in nature than hickory or mesquite smoke which makes it great for lighter flavored foods like chicken. Cherry also does not impart a cherry flavor but similar to apple the smoke is lighter, slightly sweeter in nature, and it imparts a beautiful mahogany color to the meat.
Thinks of smoke similar in terms to tasting a fine wine, although some wines will have subtle underlying flavor tones like vanilla, blackberry, or even earthy; they are not added flavors to the wine. They are naturally forming flavor tones that some people cannot detect. Smoke is the same way, lighter, sweeter with very subtle flavors that can enhance milder flavored foods without overpowering the wonderful flavor of the meat.
As far as wood chunk suppliers there are very many that sell quality chunks, but shipping can sometimes be a deal breaker depending upon where you live.
My suggestion would be to visit a local fruit orchard and ask them about their trimmings. Many fruit producers trim their trees and cut down old stock in January to avoid spreading disease to the trimmed trees. Most are happy to let you take all that you want.
If you don't have any fruit farms near you and shipping to your location is outrageous, then consider purchasing from someplace like
http://doitbest.com. You find a participating hardware store near you, order and pre-pay for the items on-line. Within a week it is brought to the hardware store you selected and you just pick them up and pay no shipping/delivery charges because it comes with their normal supply order.
https://www.doitbest.com/products/wood-chunks
hit the menu to the right to select the type of wood you wish to purchase (Apple, Cherry, Pecan, ect).
