ID please 2 ?

I found this plant in a local shop, in very poor conditions but I couldn't resist because of its beautiful flower.
Can you help me identify?

Well, I can say that it is most likely to be a Mammillaria from Baja California. The flower looks like louisae, but the body looks different. However in view of the doubts raised, quite rightly, about my M. dioica posting, and subsequent disucssions, other opinions, etc., I am going to sit on the fence on this.
Over to you Hugo??

Thanks Chris for your reply,
this picture gives a beter view on the body...and what a difference after repotting

I would also say Louisiae. The flower looks right, the body also and most important I don't believe that they sell difficult to grow species in a garden shop. Louisiae pops up regularly in garden centers.