Where can I find small bearings?

[Jarfi]

I need a bearing with 1cm radius, give or take 3mm.

I did find this http://www.docstoc.com/docs/88264470/BASIC-BEARING-DIMENSIONS

but the smallest one there has a 2,6 cm radius.

 

[Chronos]

See, for example, http://www.astbearings.com/miniature-instrument-series-stainless-steel.html

 

[Sunfire]

Also, I would check on ebay. You may find dental etc. bearings that suit your needs

 

[boneh3ad]

Have you looked on McMaster-Carr (www.mcmaster.com)? They have just about everything you could want, including a large selection of bearings.