S.H.
I used the Avent, manual pump, which I liked a lot....after having tried the Medela, which I did NOT like.
The Avent one was the most successful for me and easy to use.
I just got it from my local drugstore.
But, it depends on what kind of bottles you are using... back then when I had the Avent pump and bottles, the bottles were made with a plastic that had the BPA's in it. Yikes.
I don't know if by now it is different.
If anything, just hand expressing your breasts, can release the engorgement you might get while away and not able to nurse.
(You mentioned in your "a little about me" that your baby being a "non-sleeper"....is this because of your lack of milk supply... or her not latching on properly thus she is NOT getting enough intake daily? For some babies, this can be a reason they are not sleeping....because they are basically always hungry. Never satisfied. Perhaps, check her latch and your milk output. At night, is also a time when a baby feeds heavily, and wakes more. As she approaches 6 months old, this will be a "growth spurt" time and her intake needs will increase...) Sorry if I got ahead and "answered" that which you did not ask for.
Good luck,
Susan