Spectra s2

I think I may be getting the spectra pump with my insurance, and I had a few questions for those of you also have it..

1. Is Aeroflow the best site to get your “free insurance”pump? Or should I look elsewhere?

2. I was reading reviews on Aeroflow and apparently the bag that it comes with doesn’t fit the pump. Can you you opt out of the bag when ordering through Aeroflow to make it cheaper? Second part to this- is there a bag you recommend?

3. What breast milk storage bags do you use?

4. Are there any accessories for it that I should buy now?

Thanks!