Do you have a Dell product number, or have you tried Dell direct?

Post deleted by MHC

Not available without the PSUs - and at £40 each a little on the expensive side!

Ouch!

Exactly ... I won't risk a third party PSU on a £2k PC with 4-year warranty so don't mind it for that and have a couple left where I usually work.

Totally agree

One other suggestion would be to save a search on ebay, and then ebay will email you every time new items are listed with your seach criteria. I've used it before and it's not perfect but it's certainly helped me in the past, and you never know someone may list a genuine Dell item.