The engine diagrams:
http://www.jackssmallengines.com/Jac...on/89483/89444
They have a carb repair kit but I'm not 100% sure that is your mukini carb. It is still on the expensive side at $82.10. Some of the parts of the kit you probably wouldn't need so you could order only the parts you need separtely for cheaper.
This site
http://www.repairclinic.com/Shop-For...rburetor-Parts references the carb for that engine as part #715572. Still don't know if that is the exact carb you have or not but that one should fit the engine.
Unfortuneatly searching 715572 doesn't bring up any chinese knockoffs so I don't know what to tell you there. Here is a new one for $80 on ebay
http://www.ebay.com/itm/New-OEM-Brig...item1ea7ff2b0c
Im sure other carbs will fit it but I don't know what.