I only discovered these 'machines' yesterday so go gently with me, please.
Just looked on Amazon and found both the Black and White consules are selling for £99.99 delivered.
I ordered a black one and also an accessory kit for £2.76! (this wasn't a deal, just in general sale)
PLUS I got triple Nectar points - make sure you don't have them in your basket before going through the Nectar website though as this will invalidate your points.
I know people scorn Nectar points but Quidco don't do anything for Amazon (vouchers aside) so anything is better than nothing.
I believe that other colour consoles were a bit cheaper too but I'll leave you to look for yourself, if you don't mind - I don't know anything about them. :o)
Hope this is helpful to someone.
this is a Dsi, but still this is a nice price...