Sorry that I am late to this steak discussion.
I, for one, can strongly strongly vouch for the quality and value of the steaks available for sale at the Qing Shi Qiao market.
I frequently buy steak there, as well as lambchops, chicken wings, and butter. You’re best bet is the block of the market that backs up on to the Carrefour. You can find a good selection at many of stores, which although small, usually have large walk in freezers next door. Don’t be dissuaded by the atrocious smell, and piles of dead frogs on dirty tile floor… it is what it is. All the good steak there is frozen, and in large cellophane covered lumps in the freezers. They will slice it for you at your desired thickness, and if you request (as I do,) individually vacuum seal the steaks in bags.