I agree Mummymog. The essential bf kit is some boobs, an accessible bra, and some Lansinoh. If you want a pump you can get one delivered next day through Amazon Prime, but it's wise to establish bf first before spending money on kit.
I expressed maybe a dozen times after we'd left hospital, in 14 months. Hardly worth the fab pump I bought and I could've expressed for comfort with my hands.
(Also, don't be tempted by second hand - unless it's a closed system, milk can get into the motor and pump workings, which means someone else's milk can potentially get into your baby's bottle)