1) If you got money to spend, can buy before delivery. You might or might not need the pump. If dont need, can sell off or give as present hehe!
2) If not, before delivery, survey the stores & enquire from friends first for e best pump to get for your budget & needs. After delivery, when you think you gonna need e pump, then can send hubby out to purchase.
3) Or you can borrow somebody's pump first & put on stand-by, just in case you might need it. After give birth, can use friend's pump & when you feel that you gonna use the pump full-time, can get hubby to buy for you & return friend's pump.
For my case, I bought my Avent manual pump after delivery of my no.1. When he was held back in hospital for 10 days after I was discharged, we stopped by shopping centre right after my discharge from hospital to get the pump, coz i was gonna need it to express & send the milk to hospital everyday. Used the same pump for all 4 babies as all of them were held back in hospital for 8-10 days after delivery!