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FcrestNymph
After several hours, I finally have that list! Since it's pretty long, here's all of the familiars who are worth less than 50 gems on the AH:
Aberrant Chacma- 15g
Anomalous Nekomata- 45g
Barhide Menace- 10g
Bearded Yeti- 15g
Blushing Tangle- 10g
Boulder Nymph- 49g
Bubble Brook Gecko- 30g
Buff Laced Cockatrice- 10g
Cherry Blossom Caterpillar- 10g
Cloud Chaser- Free with purchase
Colorburst Buttersnake- 20g
Coursing Skira- Free with purchase
Crimson Emperor- Free with purchase
Crumbling Goblin- 40g
Driftwood Gem Guardian- 45g
Dripcave Deputy- 24g
Dustfeather Sphinx- Free with purchase
Everburn Tangle- 10g
Firefly Cockatrice- 10g
Firemane Manticore- 10g
Flesh Forager- Free with purchase
Gearspring Pocketmouse- 10g
Gladeveins Needletooth- 15g
Glassbound Solarvul- 17g
Golden Porpoise- Free with purchase
Harvest Floracat- 10g
Heckling Hydrena- 20g
Iridescent Scaleback- Free with purchase
Iron Golem- 25g
Jelly Drone- Free with purchase
Lap Pupowl- Free with purchase
Longneck Gladiator- 20g
Mammophant- 10g
Manticore- Free with purchase
Manticorian Provocateur- 35g
Maple Caterpillar- Free with purchase
Maren Defender- Free with purchase
Maren Sorceress- Free with purchase
Maren Wavesinger- 15g
Nightfall Imp- 20g
Pangolin Racer- 15g
Peacock Firebird- 35g
Pebblehide Stoat- Free with purchase
Petal Jumper- Free with purchase
Plainstrider Bard- Free with purchase
Quillrunner- Free with purchase
Rabid Grinfin- Free with purchase
Raptorik Wanderer- Free with purchase
Redfin Wavespinner- Free with purchase
Rosy Lake Cormorant- Free with purchase
Roughshod Sniper- 25g
Rusty Golem- 35g
Sable Feathercroak- 10g
Scarlet Serpenta- 10g
Scrapmetal Tracker- 10g
Seaglass Swimmer- 15g
Sentient Alloy- 30g
Shattered Serpent- Free with purchase
Sparkle Nymph- 40g
Spinel Vulstal- 30g
Spoiling Scorpio- 45g
Springfoot Bilworper- Free with purchase
Starry Ampelope- Free with purchase
Starspawn Flyer- 10g
Steelhound- 10g
Swallowtail Buttersnake- 20g
Teardrop Owlynx- 15g
Tengu Caller- Free with purchase
Tourmaline Vulstal- 20g
Treehorn Wolpertinger- 15g
Tricolor Yapper- 15g
Turbocharged Creeper- 30g
Ultramel Amphithere- 10g
Unburdened Billy- Free with purchase
Unyielding Sagittarius- 20g
Velvet Floracat- 15g
Vivid Wavehopper- Free with purchase
Watermelon Coleus Gecko- 15g
Waveswell Sorcerer- Free with purchase
Wind-Up Pocketmouse- Free with purchase
Windcarve Bladedancer- Free with purchase
Winter Sphinx- 20g
Wintermane Minstrel- 40g
Wispwillow Peryton- Free with purchase
Woolly Walrus- Free with purchase
Workshop Monitor- 10g
(I'm sorry that this list is very long! Also, familiars that are worth less than 10 gems, you can have them for free! Lemme know if you can afford all of this or not. I'm also fine with mixed payments or if you choose to pay entirely with treasure. :D )