These are the newegg ones I know about
Newegg.com - principal site, for customers in the United States
Newegg.ca - for customers in Canada.
Newegg.cn - for customers in China
Newegg.com.tw - for customers in Taiwan
Newegg.com/global/uk/ - for customers in uk
Newegg.com/global/in - for customers in India
Newegg.com/global/ie - for customers in Ireland
Newegg.com/global/nl - for custo,mers in netherlands
Newegg.com/global/nz - for customers in New Zealand
Newegg.com/global/pl - for customers in Poland
Newegg.com/global/sg - for customers n Singapore
Newegg.com/global/au/ - for customers in Australia
as of 6 weeks ago, it was acquired by a Chinese company... "Hangzhao Liaison Interactive Information Technology Co., Ltd."
The PC partpicker sites do your shopping for you. you pick the part and it scours for prices at partner retailers. In Italy and Spain you're likely to get amazon there tho... In US, you get about 10 suppliers. I expect the Euro and Asian sites will sign on as he service gets more popular.