I purchased a Medela Pump in Style when I was pregnant with my first son. Though the cost seemed high at first, we quickly realized that the price of the pump was well worth it! The cost of formula would have surpassed the cost of the breast pump in three months, so using this breast pump for 12 months saved us money in the long run.
The Medela Pump in Style breast pump is electric and has the capability of extracting milk from both breasts at once. I was able to complete pumping in about 15 minutes, and was able to use this pump while on break at work. It was easy to clean (I would highly recommend the disinfectant wipes that Medela sells alongside the pump). The pump has an electric cord adapter to use with an outlet, or a battery pack to use if there is no electrical outlet available. This pump is also rather durable, as it has now lasted through two boys. Replacement parts are available if you lose or break anything.