Availability of MX 3u or 2.5u Caps (in Colors?)

[VoteForDavid]

I've searched but I think I am looking in the wrong place or something.   Is there a source where one could find 2.5u or 3u key caps, possibly in different colors?  It seems like 2.5 is a standard length, but 3?  3.5?  What are the options for someone who wants an odd-length key cap?

ETA: I dug deeper and found a few places selling 2.75 caps.  I'll call that done.  Good job, me!

http://keyshop.pimpmykeyboard.com/products/blank-key-packs/dcs-2-75-space
http://www.wasdkeyboards.com/index.php/products/blank-keycap-singles/row-1-size-1x2-75-cherry-mx-keycap.html
hey custom printed http://www.wasdkeyboards.com/index.php/products/printed-keycap-singles/custom-text-cherry-mx-keycaps.html
http://www.maxkeyboard.com/row-1-size-1x2.75-cherry-mx-keycap-r1-1x2.75-right-shift.html