Hi Mustafa,
Deal Extreme has been online since 1994 and are legit in the area of their business. They also offer partnership programs such as affiliates, dropship, wholesale, promotional, and even product review programs. I've read a couple of reviews though complaining of late deliveries so if you want to deal with this supplier, note that they're based in China and may take time for international deliveries. Deal Extreme also accepts safe payment methods such as credit cards, and PayPal. However, please remember that we do not guarantee the safety of suppliers outside SaleHoo.
Hope this helps.