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blvebirb I can brew all the brewable familiars you're missing, either for the mats and t needed to brew them, no additional charge. I could use the xp.
They're the:
Leftover Residue (1 copper muck, 1 green ooze, 1 orange ooze, 1 red ooze, 1 glass beaker, 1.1k)
Rosetail (1 copper muck, 2 orange sludge, 4 green goo, 1 sizzling phosphorus, 2kt)
Kelpie (1 silver muck, 1 copper muck, 2 orange goo, 2kt)
Anomalous Skink (1 silver muck, 2 copper muck, 3 sizzling phosphorus, 10 juvenile prairie skink, 5 weird purple skink, 5kt)
Conjoined Skink (1 gold muck, 2 copper muck, 3 sizzling phosphorus, 10 Green-throated skink, 5 weird purple skink, 5kt)
Amberwing Waveskimmer (1 silver muck, 1 copper muck, 1 glass beaker, 12 cinnamon, 5 royal oyster, 5.2kt)
Great Blue Waveskimmer (1 gold muck, 1 copper muck, 1 glass beaker, 12 green shoots, 5 Olympia oysters, 5.2kt)
Lesser Wisp (1 blue goo, 3 green ooze, 2 orange sludge, 1 irradiated alchemical reduction, 1 silver muck, 5.3kt)
Iron Golem (1 copper muck, 1 silver muck, 2 red ooze, 3 pickaxe, 1 glass beaker, 5kt)
Rusty Golem (1 copper muck, 1 gold muck, 2 red sludge, 3 rusty pickaxe, 1 glass beaker, 5kt)
Acid-Tongue Serpenta (2 copper muck, 3 orange ooze, 3 yellow goo, 3 green sludge, 4kt)
Protobeast (2 gold muck, 1 copper muck, 1 red goo, 1 coarse alchemical reduction, 1 infused fragment, 5.5kt)
Painted Protobeast (2 silver muck, 1 copper muck, 1 purple sludge, 1 coarse alchemical reduction, 1 infused fragment, 5.5kt)
Algae-bottom Slarg (2 silver muck, 1 copper muck, 3 orange ooze, 3 yellow goo, 2 purple goo, 5.7kt)
Tar-trooper Slarg (2 silver muck, 1 copper muck, 3 yellow sludge, 2 purple ooze, 3 orange goo, 5.7kt)
Anomalous Nekomata (1 silver muck, 2 copper muck, 3 yellow goo, 3 purple ooze, 8 eye agate, 5.7kt)
Irregular Nekomata (1 gold muck, 2 copper muck, 3 yellow sludge, 3 orange sludge, 8 Foo's Eye, 5.7kt)
Peacock Spider (1 silver muck, 1 copper muck, 3 yellow goo, 2 orange ooze, 1 glass beaker, 5kt)
Speckled Peacock Spider (1 gold muck, 1 copper muck, 3 yellow sludge, 2 green goo, 1 glass beaker, 5kt)
Firefly Cockatrice (1 silver muck, 1 copper muck, 2 green goo, 5 basilisk feather fan, 5kt)
Quartz Cockatrice (1 gold muck, 1 copper muck, 2 green sludge, 5 giant feathers, 5kt)
Bubble Brook Gecko (1 silver muck, 1 copper muck, 1 purple ooze, 1 reinforced glass beaker, 5kt)
Cosmo Gecko (1 gold muck, 1 copper muck, 1 purple goo, 1 reinforced glass beaker, 5kt)
These are all the ones I saw in there, aside from the Juvenile Starsweeper that someone's already offered to you. If there are other brewable familiars I can make them but didn't spot them in your wanted mass.
If you like the idea of straight brewing we can do as few or as many as you'd like at a time, just send the CR and note which one(s) you want brewed and I'll send the familiar(s) back as soon as they're brewed.