Is dealjoy already partnered with online merchants?

Yes,they have some big names already ,check their website for more info.

eBay, Booking.com, Alibaba, iTunes, Nike just to name a few.

Those are big names, and they should help alot in the beginning after platform going live.

Yes those really are famous retailers. So will it be possible to trade with thwm directly?

you mean like directly on their website? Or through an app?