After a lot of searching at the start of March, I could find no-one with stock in the UK. In the end I spoke with a local company (have used them for 20 years!) and they happily ordered one. Initial estimate of 2 weeks actually turned into about 10 elapsed days.
If you want one, accept a delay if that's the best you can find (5 years down the line, you won't remember 2 weeks of delay!) and use a store you trust
to order and wait patiently is my advice
I put 6x1GB ES.2 Barracudas into mine - I'm really pleased with it! And expecting 5 years plus life from it.