Well, part of it used to be that IBM made up larger quanties of certain variants and used those variants and supplies for things like "get it tomorrow", extended support lifetimes, different supply chains and distribution channels, corporate supply offers (so you could get the exact same model for years, after it normally would be end-of-lifed), and the educational discounts. I don't know what Levano is doing.

Not every model is available through every channel, which would effect the discount at various points.

--Nathan