Price list from WowPets. I took from this list the top 25 you can farm. Two gold numbers are here, first is US realms, second is price across 25 realms
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Everliving Spore
496,926
557,142
From Wailing Caverns Damp Pet Supplies quest reward -
Spineclaw Crab
292,648
289,199
Drop: Monstrous Spineclaw (Timeless Isle), a long long grind -
Hatespark the Tiny
277,510
295,163
Drop: Ragnaros the Firelord (Molten Core (Anniversary Edition)), about a 11% drop rate from LFR -
Seaborne Spore
260,618
255,885
Drop: Fel-Touched Pet Supplies (Tanaan Jungle), kill the pet masters on Tanaan, about 1 in 400 chance in supply bag -
Knockoff Blingtron
258,556
258,636
Drop: Blingtron 6000 Gift Package, rare, I haven’t seen it yet -
Crawling Claw
242,778
246,110
Profession: Archaeology, Tol’Vir archaeology rare item -
Coldlight Surfrunner
235,914
356,613
Drop: Island Expeditions, drop from Murlocs -
Baby Crawg
183,141
225,960
Profession: Alchemy, BFA transmute meat to pet, no luck for me yet -
Gearspring Hopper
163,077
129,104
Profession: Alchemy, BFA transmute meat to pet, no luck for me yet -
Accursed Hexxer
160,276
176,278
Vendor: Shoak (Nazmir), Horde Quest activated (An Ancient Curse) -
Searing Scorchling
157,901
157,897
Vendor: Zen’Vorka (Molten Front), about 1 month of dailies -
Frenzied Cottontail
140,498
143,868
Vendor: Nigel Rifthold (Drustvar), takes an unlock involving buying chocolates from Xun un in Anyport -
Swamp Toad
130,382
154,658
Vendor: Shoak (Nazmir), Horde quest unlock -
Living Fluid
128,569
131,227
Drop: Primordius (Throne of Thunder) -
Tiny Red Carp
127,230
141,928
Profession: Fishing in Townlong Steppes, 36.3 53.6 up to 5000 casts -
Smoochums
113,283
98,054
Vendor: Nigel Rifthold (Drustvar), chocolate quest unlock Xun Xun -
Vengeful Chicken
112,266
108,470
Quest: Cutting Edge Poultry Science, quest in Waycrest Manor dungeon after you kill kitchen area -
Sandshell Chitterer
111,998
82,277
Drop: Island Expeditions, kill unamed rares -
Tiny Blue Carp
111,613
148,446
Profession: Fishing, Various Pandaria zones (read comments) -
Bloodfeaster Larva
110,156
87,080
Vendor: Shoak (Nazmir, Blind Wunja, Horde) -
Seabreeze Bumblebee
110,135
115,752
Vendor: Sister Lilyana (Stormsong Valley, Sister Lilyana revered Storm’s Wake) -
Lil’ Ben’fon
102,212
106,095
Vendor: Happy Holaua (Zuldazar) -
Bloodfeaster Larva
100,680
133,259
Profession: Alchemy, transmute meat to pet -
Corlain Falcon
99,328
82,629
Vendor: Quartermaster Alcorn (Drustvar, revered order of embers) -
Lil’ Tika
97,494
91,188
Vendor: Happy Holaua (Zuldazar) Horde Quest