actually very difficult to find "expensive" 2mm, or any 2mm mechanical pencils on the net. and due to my being very bored at work, ive actually looked quite a bit for you...
i found some resources that may help you like the above link i posted:
http://www.cultpens.com/acatalog/Mec...l_Pencils.html
a pretty cool resource - it even has a "pencil finder" where you put in the specs u want and it searchs for a match... everything i find is >75$
(link to my search:
http://www.cultpens.com/acatalog/Pen...hp#ls=2,pencil )
http://www.leadholder.com/forum/
a forum with people much like yourself (ask there u might get further)
hope you find one, let me know when you do
P.S. seems to me that the smaller the lead size, the more expensive they become. found a few .3mm lead mech pencils upwards of 250$