Congratulations on your journey as a first-time mum! Since you walk around a lot at work, I would really suggest looking into a wearable hands-free pump like the Youha or Momcozy, as they tuck right into your nursing bra so you can move freely without any hassle, and both are well within your budget. Many working mums in our community have been very happy with those, so hopefully it helps you narrow down your choice!