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Thanks, no the brand isn't known very well. It's a startup.

A customer is releasing a brand new and world wide unique product in the next few weeks.

I want to send out press releases to the biggest and most serious press release portals to get this news out in the world.

Can you recommend me some english portals in the UK / U.S.A. and maybe Australia? 
It's no problem if they are expensive and i don't need links in every case.

Thanks.