This looks very similar to a cabinet that Showplace Wood Products makes, however there are a few differences that suggest otherwise. One caution I would point out -these cabinets MUST have adequate clearance on each side, especially if placed next to an appliance. When used correctly, they are a very nice alternative to the traditional lazy-susan cabinet

Where can i purchase these cabinents?

This is looking very good.

Diamond Cabinets also make a corner drawer unit. Diamond is a Master Brand cabinet line.