Cross-posted to Dolly Market Forums and Livejournal for maximum benefit.

Ai dolls are a tiny, plastic (not resin) ball-jointed doll produced by Jun Planning/Groove, the same people who make Pullips. They come fully dressed and with a unique faceup per model, but their wigs and eyes are easily removable (respectively with Velcro and eye putty) for easy customization. There are 4 different face molds for Ai Dolls; there is a guide to the four types, with examples of each one, here.

Basic Ai Doll Reference Info

• Klein's Complete Ai Doll Release List
• Ai Doll FAQ
• New Tuesday Morning Ai Doll Appearances List [in-progress]
• New All of the Ai Dolls and their info are now at the dollwiki: all about Ai dolls blog.
• Ai Dolls are off-topic at Den of Angels, but so is practically everything else.

Size Information

• Size classification: tiny (info source: ball-jointed doll wiki)
• Height: 14cm (info source: ball-jointed doll wiki)
• Size Comparison Photo: 11cm obitsu |Ai doll | Hujoo baby (info source: Cornflower Blue)
• Size Comparison Photo: Hujoo Baby | Ai Doll | Junky Spot Nano Rabi (info source: Dolly Confessions Blog)
• Wig size: 4-5 (info source: Klein)
• Eye size: about 10mm (info source: Klein)
• New Sewing sizes:
  
  Ai vs obitsu 11cm body measurements by goche moche on Flickr

Places to Obtain

• Tuesday Morning (local. American store chain.)
• Pullip Style: Ai Doll bjd (on sale!! )
• Amazon.com: ball-jointed doll ai
• JPGroove (official website) : ball-jointed doll ai
• Ebay.com: ball-jointed doll ai
• Buyee (official Yahoo Japan Auctions/YJA Go-Between website) : ball-jointed doll ai

Dolls Same Clothing Size as Ai Dolls

• hujoo baby (info source: Cornflower Blue, Nubanded on etsy)
• Petite Blythes can donate very loose clothing, such as Tsuki Usagi's stock, but it will be tight. (info source: I've tried it...)
• placeholder

Sources for Ai Doll Wigs

• Mimiwoo Ebay: 4-5 wigs
• Etsy: DOLLWIG
• Mini Pullip wigs fit Ai Dolls (info source: tried it.)
• Juju's Dolly Mall Ebay: 4-5 wigs
• Oobie Doll (double-check the sizes!)
• Mimiwoo.com: 4-5 wigs
• Denver Doll Emporium> Leekeworld Wigs > 4-5 Wigs
• Cancan J-series: 4-5 wigs
• Ruby Red Galleria: 4-5 wigs
• Facets by Marcia: size 4-5 wigs
• Fabric Friends Dolls: 4-5 wigs
• Monique Wigs (pick wig style, and then size, color etc.)
• Eva Li on Etsy: 4-5 wigs
• Jpopdolls: 4-5 wigs (category)
• LalamShop on Etsy: Little Pullip Wigs (note: about the same size)
• BJD Fairyland on Etsy: 4-5 wigs
• New Beachgirlnikita Ebay: 4-5 wigs

Sources for Ai Doll Eyes

• LPS Blythe eyes fit ai dolls, although you have to use eye putty to attach them to the mech (source: I tried it)
• Mimiwoo Ebay: 10mm eyes
• Mimiwoo.com: 10mm eyes
• Fabao doll shop on etsy
• Juju's Dolly Mall Ebay: 10mm eyes
• SAEYECHIP Etsy: 10mm eyes (note: paint-your-own clear eyes)
• Pupa Paradise: 10mm eyes (note: paint-your-own clear eyes)
• The eyes from Liv Dolls fit, although you must use eye putty. (info sourc tried it The entire eyemechs from Little Pullips fit, although you must squish/crush some of the outer protruding places and use eye putty. (info source: tried it)
• New Pang-ju stock eyes will fit Ai Dolls. (source: tried it)

Sources for Ai Doll Clothes

• Etsy: Nubanded
• JCsTinyTreasures on Etsy: Ai Doll clothes
• Silly Kitty on Etsy: Ai Doll clothes
• Wee Designs for Dolls on Etsy: Ai Doll clothes
• The shirts from Vi and Va fashion packs for Ai Dolls as dresses (source: GreysPrincess)

Other

• The sturdy, pretty, portable, bookshelf-suitable boxes Ai Dolls come in can be used to make some pretty sweet mini diorama with those same properties (thanks to Elderham for reminding me to post this! )

Data still needed:

• Other tiny bjd who wear the same clothing size.

Please post your info and photos!