Working excavator thumb?

[Daveroo]

has anyone built or is there a commercially made one to buy? thumb i mean,im looking at the komatsu PC 490 kit from CSMI,and would like to add a working thumb.if anyone who builds would be willing to build one for me,ill pay what it takes,i dont have the skill or ability to build anything anymore..lol..well ever..
btw: is csmi in business?.ive sent two emails lately and havent heard back.one was about three weeks ago..the other was just the otherday,so im sure they havent seen it.