Get in touch with at least 10 potential suppliers, to evaluate if they could match you.
Request quotations from them, to get a first pricing, then you will likely get several very similar quotes, that’s the “market price”, Eliminate all the “outliners” that gave prices 20% higher or lower than the average.
To visit in person, or audit by a third-party, to have a further and better knowing about them, and try to select 2 or 3 suppliers as the candidates.
Share more information about your requirements, ask them to update their prices, then compare and choose the RIGHT one with your all-round consideration.
Kindly be reminded that If you negotiate a very low price, most suppliers will end up saying yes, then they will wonder how to make your products, in China price is very closely tied to quality, you will get what you pay for.