I would highly recommend investing in some reusable breastpads rather than the disposable ones. I use little lamb ones and they are soooo much kinder to sore nipples. I found the disposables ones leaked through quite quick (my record was three sets in 30 mins!) and they also gave my boobs a weird shape! I had two packs (so 10 sets but that went down to 9 as the dog ate one!) and I found that was plenty as I would only use one set during the day and one set overnight.
We still don't use anything on DD's skin as she has really sensitive skin and quite bad eczema. Even if you want to use products I would wait to buy them as we were bought loads as presents so have ended up with a cupboard full!
I would also be tempted to buy more muslins! We went thought loads. I'd probably buy more muslins and forego the bibs as muslins can double up as bibs.
Cot bumpers aren't recommended as Broody said but it is personal choice so I would just read up.
The baby bath/sling is an interesting one. We didn't bother with DD as it seemed an unnecessary expense, but I have bought one for this LO (first and only thing I have bought, but annoyingly it is faulty so I have to take it back! Grr) as actually I think it will make it easier. We didn't bath DD that much as we actually found it quite difficult. But they are so easy to pick up I would wait and see if you think you need one first before buying.
I also wouldn't get too hung up on recording all feeding/changing (I did the first time round, especially as we were in hospital for a while and they used to look at it there). It might be useful for the first week or so, particularly if you are trying to establish breastfeeding to ensure the baby is feeding enough (and not being a lazy so and so like DD! we used to have to strip her clothes off and tickle her feet to encourage her to feed more - useful trick if baby is a bit lazy and doesn't feed probably!) but I found it was just causing me stress trying to remember to write it all down, and actually as long as they are having plenty of wet and dirty nappies, feeding well, and gaining weight, the baby will usually fall into their own little routine. But I guess this depends on if you want to be baby-led or routine led in your parenting.
But as with all things parenting and child related it is all very much a personal choice. I found it very useful having advice from people who had done it before and then picking and choosing what felt right for us, as everyone has different opinions. It's also really tempting to go out and buy everything you think you need before baby comes but my advice would be to buy the minimum and see how you get on when baby is here. I put money away whilst I was working to pay for everything and then bought things as and when I found I needed them when on maternity leave. It meant we didn't end up wasting money (who can afford to do that these days!) but didn't have to find the money to afford them when on mat pay.
Sophie I've had a few friends with low lying placentas and they have all moved clear enough for natural births. Just think of the positive of another scan at 34 weeks 
I've come into work this morning and our server is down which severely limits the work I can do (hence the mammoth post!). Feeling much better today than I have in weeks though so hoping I am over the worst of this virus now. Definitely the right decision not to go away this weekend though.