Hi MikeM87,
I'm in the UK and was in the same postion myself (though I was after the black 16gb) and I started watching the UK site. Neither of the 16gb models ever seemed to come up.
Someone pointed me to a site called
http://www.refurb.me It has an update of all the refurb items on both the US and UK stores as they come up on the apple store. Found it much easier to follow than the Apple site, especially as you can set the price to £300 which cuts out loads of items other than ipads and ipods and it shows when the items were last up.
I watched and it seemed that the 16g refurbs seem to go on after 12am or 12pm two or three times a week. I found myself checking around those times when I could and within a couple of days I got lucky and managed to bag myself a 16gb refrub for £259. Great deal and it's in perfect condition.
Try that site and good luck