Same as ruf and tan for me - I picked up a Target BabyLove microwave steriliser for half price on sale, only cost me $12.45 I think. I used it for my breast pump, although current recommendations are now that a breast pump merely needs to be rinsed after every use in cold water and washed once a day, either on the top row of the dishwasher or in hot soapy water. Because it only comes in contact with breastmilk it is not prone to any bacteria (unlike bottles, which also come in contact with the baby's mouth - I believe, but check with the ABA on that one!).

I wouldn't buy an expensive one unless you find you bottle feed and need it after bubs is born.