Suidoubashi Heavy Industry made KURATAS that is the first giant boarding-robot. The spec is "Height : about 4,000 mm / Width: about 3,000 mm / Length : about 4,000 mm / Weight : about 4,500 kg, Control system : AE V-sido".
Now on sall on Amazon. (sold out now :-) Price is 1,353,500 USD. 983,453 EUR. You can choose weapon, parts, color. coqpit and name on it by opion.