Does anyone have any recommendations for sources of tiny display cases for this size? Since it's a bike dio, it doesn't need to be tall. I'm looking for something that resembles a clear cube. Wave produces a tiny square wood base, but I want to have a clear top over it.

You could try a baseball display case like this:

http://www.ebay.com/itm/BCW-Deluxe-Acrylic-Baseball-Holder-Display-Case-UV-Protection/381045919311?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D35694%26meid%3Def0fcc50df334872b96e7849ac221c0a%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D271342781671

There's quite a few choices of black base with clear case - for example, this one is small

http://www.ebay.com/itm/2x-Trumpeter-Model-Display-Cases-Showcase-111-x-61-x-63mm-GSE-/262039599532?hash=item3d02c6f9ac:g:jGkAAOSwQPlV7lk0

and this one is cubeish

http://hlj.com/product/WAVTC-091/Sup

Am using the tall version of this one for a 1/35 motorcycle diorama

Miwa,

This company will custom make acrylic cases. I've used them many times.

http://www.casesforcollectibles.com/

Dave

Trumpeter makes these (among many other sizes) for 1/72 models. They would probably also fit a 1/35 MC. http://www.trumpeter-china.com/index.php?g=home&m=product&a=show&id=2531&l=en
The only drawback to these kind of injection molded styrene cases is that they always have some kind of molding nipple on the case top.