201 stainless steel coil is always very tricky in China. Different mills may have different standards for 201. Basically, it can be classified like this. For 201 stainless steel sheet coil, it is mainly from bigger mills. Like LISCO/Baosteel/Beibuwan/Hongwang Their production is mainly about 201 J2 grades, which has less than 1% of Nickel, and relatively cheaper price. They also have 201 J1 products, around 100 USD more expensive than J2.
For 201 LH, LJ, and L1, they are only from LISCO, which is mainly famous for their 201 products. J1 has 1% Nickel, which is the most expensive grades. 201 LH is the cheapest one compared to other 2 grades. LJ is invented recently and target oversea market.