Both the Shelter 501 and 901 are low output MC cartridges. They are also low compliance, at 9cu each. They are both probably the best values at their respective price points, if your arm can handle the compliance. They can be purchased from EIFL imports from Japan, of Axxis in the US. Wavelength Audio was the previous importer, and may have some left. The low output may require a step-up device, if your preamp is low to medium gain.