Unique Wild Shape Options

I'm playing in a new 5.5e game starting as a level 5 druid and I"m looking for some unique wild shape options. Ones like the Moorbounder from Explorer's guide to Wild Mount or the Ice Spider Queen from Storm King's Thunder, where they aren't actual animals and only exist in DND. Can you help provide more examples like this so I could potentially have an entire list of unique wild shapes? It can be anything so long as it is a Beast who fits within the wild shape levels and is from any official dnd sourcebook (basically can you buy it on DND beyond).

Giant Fly

Just some proposals: Almiraj, Chimeric Baboon (check also Chimeric Cat, Fox, Hare and Rat), Flying Monkey, Giant Snail, Ice Spider, Jaculi, Knucklehead Trout.

If you can use 2014 stuff, search DND Beyond for beast of the appropriate CR: Monsters for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond. Some will come up that you can't access without having purchased that book, but that will give you something to go on. pretty sure the ones you mentioned are 5e, not 5.5. Also, a lot of 5E beasts were changed to celestial or something else in 5.5 so are no longer wild shape options (giant elk, giant eagle, giant vulture, etc). The flying wild shapes are pretty limited now -- I wound up choosing giant Wasp (8th level stars druid).

I see someone mentioned the Giant fly from the Ebony Fly - figurine of wondrous power.

Quote from MasterMattofCeremonies >>

I'm playing in a new 5.5e game starting as a level 5 druid and I"m looking for some unique wild shape options. Ones like the Moorbounder from Explorer's guide to Wild Mount or the Ice Spider Queen from Storm King's Thunder, where they aren't actual animals and only exist in DND. Can you help provide more examples like this so I could potentially have an entire list of unique wild shapes? It can be anything so long as it is a Beast who fits within the wild shape levels and is from any official dnd sourcebook (basically can you buy it on DND beyond).

Crag Cat is one of my favourites. D&D Beyond lists it as a Monstrosity, because in some later books it was printed as one, but in the original books it's a Beast and was for many years so your DM may let you play it as one. It's a super cool option imo.

Also MCDM's options are really good--they're still actual animals, but they give some optional feature tables to distinguish different types of wildcat (for example), some of which are really fun.

And in 5.5e, they keep changing beasts to other creature types like celestial (giant eagle, giant vulture, etc). 

5(.5)e options are very disappointing. There should be some monstrosity wild shape options. Hopefully the circle of the Titan UA subclass is indicative of the future direction of wild shape 

Circle of Flowers from The Field Guide to Floral Dragons has unique wildshape options.