This is very me! I'm 26 weeks so far. I made a spreadsheet (coz I'm a geek like that) and wrote down everything I would need/ want and looked up best prices for new stuff online. It came to £2651! And that was for low to medium end stuff (the car seat and pram were the biggies, didn't really want to scrimp on those) and it didn't include nursery furniture like a wardrobe or drawers, I suggested we use furniture we already had. It does include hopsital bag stuff such as lansinoh cream and maternity pads.
So far I have pretty much everything except a changing bag, cot mattress and stairgates, which should come to about £200 (we have very narrow stairs so only have one choice of stairgate and I want a natural fiber mattress) but so far have spent £867.
Biggest bargains were bugaboo cameleon - £161, which would have cost over £1000 new, not that I'd ever have bought it new, as it came with loads of accessories. And kiddies kingdom are currently doing the raspberry red maxi cosi cabriofix care seat for £109, every other colour and every other shop are selling them for £135 and they virtually never go on sale. We had bought a mothercare ziba car seat but after reading the reviews of car seat safety I just knew I couldn't forgive myself if I didn't buy the best we could afford, so we found the money for the maxi cosi.
Everything I've got is second hand except for mattresses and car seat - cot was £10.50, crib was £15 including a whole load of sheets for it.
We've decided to give cloth nappies a go to save money long term - I've bought several brands and enough to last us from birth to potty for £59 on ebay including postage. And if we don't get on with them I can always sell them on.
So far everything is from ebay, usually with local collection. I haven't found the facebook selling groups very useful, ones near me are just full of toys and we aren't at that stage yet.