Perhaps you can try Link hidden: Login to view they accept payment via PayPal, so I think it's safe.
I visited the site you recommended, cnshow and they seem like a smaller DH Gate with various sellers for different products. I did notice 2 things though -
1. The site links like Sign Up, Join Free, Community and Help didn't work.
2. There were many categories that had no inventory at all.
They have been online since 2004 and by the looks of it, the site seems unmaintained. But in fairness to the site, I was not able to find any negative reviews online...
Accepting PayPal does not always make a supplier 100% safe. There are also other factors that you may want to consider like site age, level of customer service - contact info provided/accessibility, reviews and feedbacks.