This has been asked a few times of the forums. This post has a few examples. Your best bet is Oberlo if your wanting cheap gadgets to sell though,
Hey @MarioK! Gabby here from Spocket. What specific gadgets and tech items are you looking for? Have you tried signing-up for free on Spocket and exploring its catalog? If not, then I highly suggest you check it out to find if the products you need are available. If not, please do let me know so I can inform our suppliers team and ask them to source out the products for you.