用英语怎么表达:现在的价格大约为$5.00,最低为$4.00??

the price is about 5 dollars, and the minimum/bottom line is 4 dollars.

The price is based on the order quantity, but I can still give you a rough/approriate price.
我搞外贸的，经常跟老外说这个东西。

the price is about 5 dollars, the minimum is 4 dollars

Its current price is about $5.00, $4.00 at least.