http://www.wmshop.cz/en/Modules-GSM-...archparam=pls8 modem 113EUR plus shipping
http://www.digikey.com/product-detai...100-ND/2695734 SoC/CPU ~50US$
http://www.netcomponents.com/sitemap...00CA-A506.html 1GB RAM + 512MB NAND POP chip: probably 25EUR
http://www.jorjin.com.tw/#!wg7351-00/c1dnh WLAN+BT+FM module ~30..40EUR
http://www.handy-ersatzteil-service....er_Tastur.html kbd 18EUR
http://neo900.org/stuff/joerg/N97-ca...7_06-13-16.jpg main camera ~15EUR
http://neo900.org/stuff/joerg/random-media/DSCF0308.JPG 8-layer & 4 -layer PCB some maybe 50EUR
http://www.digikey.com/product-detai...3CF-ND/4316075 32GB eMMC storage 66US$
or http://octopart.com/mtfc64gjddn-3m+wt-micron-29101638 64GB eMMC storage 95US$
or the original one with much doubt about possible counterfeit or defect chips: http://www.aliexpress.com/w/wholesal...g8d8eba12.html

several other "smaller" components that finally add up to >300EUR (or even >400EUR) for Bill Of Materials (BOM) without assembly, just for getting the mere chips/parts
Add on top the costs for R&D (incl FCC/CE et al cert), the assembly(making the boards, SMT)/QA/packaging, 10..15% at least for warranty excess production, and maybe we also want to earn a buck or two on each board.

"case":
NEW: custom made spacer frame http://neo900.org/stuff/joerg/spacerframe/sketch.pdf - maybe 10-20EUR
"OLD" (from existing N900, or spare parts)
http://www.handy-ersatzteil-service....uchscreen.html ~60EUR
http://www.amazon.com/Screen-Display.../dp/B0055MQ408 40EUR
http://www.handy-ersatzteil-service...._Platinen.html 40EUR
http://www.aliexpress.com/item/10pcs...568751892.html 10..20US$
(all of the above - 'case' - might be available for - even much - better price, but not guaranteed that we can find sufficient numbers of them)

When you're interested in a 300EUR device and don't mind the downsides this inevitably comes with, you're better off with e.g. a Jolla.

cheers
jOERG