I have been using Traeger pellets since I bought my used MES. I buy them at Costco when Traeger has a kiosk in the store. $12 for 20lb. I think if you buy 2 bags the shipping is free. At least it used to be.
I have apple, cherry, hickory, mesquite, and oak (not my fav). For beef I like 50/50 mesquite/hickory.
Traeger said their pellets are 2/3rds White Oak or Alder depending on which coast it was made on and 1/3rd the flavor on the bag. BBQ'ers Delight 20lbers are similar blended with a fraction being the flavor on the bag. Fuel and flavor with the big bags. The oak burns cleaner, hotter with less ash for pellet burners in pellet smokers. Like Todd's pellets, the BBQ'ers Delight 1lbers are 100% wood on the bag.