Market research firm iSuppli has done its typical teardown of a new iDevice, and come up with figures for the iPhone 4. According to iSuppli, a 16GB iPhone 4 costs $187.51 to manufacture (parts only).

That number compares with figures for the 16GB iPhone 3GS of $179, and for the 16GB iPhone 3G of $174. The first generation iPhone (8GB) cost $227 in parts to make.

Those figures do not include manufacturing labor (which we already know is quite low), marketing, advertising, or development. The 16GB iPhone 4 costs $199 with contract, while the 32GB iPhone 4 costs $299. Those are heavily subsidized by AT&T, of course.

Additionally, according to Kevin Keller, who oversaw the teardown for iSuppli, the materials costs on the iPhone 3GS have since dropped to $134 since the 2009 report, as prices of certain components have dropped. An 8GB iPhone 3GS model is still sold for $99.

In terms of specific parts, the so-called highly hyped "retina display" is the iPhone 4's most expensive single component, at $28.50; it "may" have been made by LG Display, iSuppli said.

The new gyroscope chip was supplied by STMicroelectronics at an estimated cost of $2.60. STMicroelectronics also supplied the 65 cent accelerometer. Apple’s A4 processor, which is manufactured by Samsung, reportedly carries a cost of $10.75.