iSuppli's just released its estimated cost of Apple's newest offering, the iPhone 3GS. Total costs for the 16GB model costs $178.96 to manufacture, according to them -- give or take $4.63 more than the 8GB iPhone 3G estimate from last year. It's also about $40 more than iSuppli's most recent manufacturing estimate for the Palm Pre. The estimate covers only materials, and doesn't take into account various costs such as shipping and distribution, packaging, royalty fees or all the miscellaneous accessories included with each handset. Regardless, it definitely looks like Apple's managed to step up the innards of the phone without a significant bump in costs.