Cheapest is showing £83 for me
It wont support 5000 series out of the box. You will need to update the BIOS to use it.
Great board, in it's time, if I was in the market for a b450, then this is great, think I paid around £80 only last year.
Very unlikely these are quite old boards now 3000 series should be okay but the 5000 I would be doubtful
so this would support 5600x cpu out of the box no bios update needed?