Changing price of SSAW steel pipe every moment

It would be a skilled task for getting the relative low price when wholesale the SSAW steel pipe from manufacturer. This would be include market research, price estimating and so on. How could we figure out the considerable price when we need to wholesale?

Doing research needs data and there is the price changing in one month, we can get some rules from it maybe.

From the price list of December 14th, 2017, we can see that the SSAW steel pipe with API 5L is 655 USD/Ton.

And it down to 625 USD/Ton a week after. Actually, some customers would like to wholesale steel pipes at this moment for stock.

However, a week later, the price is 585 USD/Ton and this would make some customers mad as the price down again.

But we should look at it ups after another week with 645 USD/Ton.

Actually, doing some market research would be good for the price judgement.