Legally unlocked iPhone 3G original price?

What is the original price for a legally unlocked iPhone 3G (16GB model) in $USD? ** not the ones listed on eBay and people bidding on over here:... show more What is the original price for a legally unlocked iPhone 3G (16GB model) in $USD?
** not the ones listed on eBay and people bidding on over here:
http://shop.ebay.com/items/?_nkw=legally+unlocked+iPhone+3G&_in_kw=1&_ex_kw=&_sacat=See-All-Categories&_okw=legally+unlocked+iPhone+3G&_oexkw=&LH_IncludeSIF=1&_udlo=&_udhi=&LH_BIN=1&_sabdlo=&_sabdhi=&_samilow=&_samihi=&_ftrt=901&_ftrv=1&_sadis=200&_fpos=&LH_SubLocation=1&fsradio2=%26LH_PrefLoc%3D1&_sargn=-1%26saslc%3D2&_salic=1&_saact=1&LH_SALE_CURRENCY=0

and where those sellers get the legally and officially unlocked by apple iPhones from? if its not from the Apple store

I mean do they buy it from retailers and unlock it for worldwide use, how much that costs?

Thanks
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