I would like to know if body building supplements such as: myoplex, whey protien, L-glutamine, and caseinate are easily available and not that expensive. (under seventy dollars or so)I have also been told that a certain chain of gyms called "Body Factory" is the best around Madrid and other large cities ,and I wanted to know if this was true?

There is a place called Viva el músculo at Hortaleza, 41 . I'm not sure if they sell the products you are talking about but they have a wide range of products.

I have yet to find a store in Madrid that sells bodybuilding supplements. I brought enough supply with me when i moved in September. After extensive research I joined Holiday Gym. They have the best setup including adequate equipment. They also have several branches in Madrid.