Samsung's 3.7" AMOLED display (as used in the Nexus One) costs $23.5

iSupply estimates that Samsung's 3.7" WVGA AMOLED touchscreen used in Google's Nexus One phone costs $23.5. The whole bill-of-materials of the phone is $174.15. The most expensive part Qualcomm's processor ($30.5).

Google Nexus One