It depends on whether you need the service for daytime only or day+night time and no. of days (include weekend??)
my mum helped to look after a baby previously, day time for Mon-Fri only, around $4k not incl. bb products.
you may think it's expensive as this price is nearly same with employing a phil. maid. however, local ee's service is far more better than maid and there is no additional chg (eg. medical exp, air ticket fee). the downsize is maid can help in all kinds of work in your flat.