Oh boo, stranded! What a pain! And such a pricey shop, you'd have thought their returns would be decent...
I'm being a bit relaxed about mattresses because our 1st child is still in the cot, the gap between our 2 is small & everything's been in our house in the meantime. But that said, I think we're going to get a snuzpod rather than the bassinet we used last time, & we're getting a new buggy, so will need a new mattresses for those bits anyway...
Breastfeeding bras are a headache, at least they were for me. Definitely not worth buying any yet, as things are likely to get a lot larger in the last few weeks, & then enormous once milk comes in.
I've never been back to my pre-first-pregnancy size (but was still breastfeeding when I got pregnant again), so have a bit of a bra library. I wish that looked as glamorous as it sounds. 
I am melting in this heat. MELTING. Vastly prefer winter pregnancies to summer ones, my word! Nothing for it to but to eat ice cream for dinner...