With the recent price hike, they are back to 2014 prices, so indeed would like them to drop also.
I paid about £129 for a Crucial M4 512GB back in April 2014, nearly 3.5 years ago. It was an Amazon Warehouse deal so probably was £20-£30 more new. It still works well in my laptop today.
In my desktop PC I use a combination of a 256GB Micron SSD that came with the PC and a 480GB SanDisk Ultra II a work colleague no longer wanted. She went back to HDD (seriously) after losing a lot of work when her SSD failed (one day working, next day not detected in BIOS). I gave her a lend of a 500GB HDD, but when she got her SSD replaced under warranty, she asked if I would take the SSD in exchange.
Whenever 1TB M.2 SSDs come down enough, I’ll probably get one.