Ok hunting for reagents is rough and most likely you want to combine it with other sought out items worth hunting down. The only creatures that I know of that drop both of these reagents will be found in Housing instances. Sir Lyonel LaughingStorm (Tier 1) in Grand Tourney Arena (Tier 1) and Rattlebones (Rank 7) in Rattlebones Master Challenge.
Within my knowledgeability I have 64 creatures that drop Aether. Rattlebones, listed above, also drops the Skeletal Pirate Treasure Card that Dezzy mentioned. Of the 64 creatures that drop Aether, a whopping 52 of them also drop pets! There are 35 critters that drop Aethyr and Pet Snacks Rank 7 or higher.