If you're remodeling and need to add space in already-small bathroom or turning a closet into a half bath you may have need of a tiny bathroom vanity. Commercial models can be very expensive, but you can combine an IKEA Lillangen sink and faucet along with a Besta cabinet to have a 40cm deep vanity for around $US250.
IKEA modification weblog IKEA Hackers recommends that combo specifically for a combination of tiny size and low budget. For a modern minimalist vanity this size you'll normally have to pay around twice the $US250 project cost.
Small-room bath vanity/sink [IKEA Hackers]