All the eastsheen cubes are the same. The different letter just represent the different packages. A is the cheapest, because it's just wraped in plastic.
I've bought from HuskyOmega. I actaully like him more, due to his lower prices. They're not much lower, but if you're not ordering anything else from cube4you, huskyomega is a great resource. His package deals are great too.
I also bought from HuskyOmega. He had "well packaging" and very good prices. At the time I didn't know what a Famwealth cube was so I bought the package deal for all 4 size cubes. Including shipping it was only a little more than $50