I have an alpkit phud, nice and light and very cheap. It served me well in the summer. The only thing that annoyed me about it was the shoulder strap, would have preferred to have two (like a rucksack)but for the money I paid I wasn't disappointed!
Have a look around on eBay too, I got a moon Saturn and a dmm highball that were in prime nick for 155 in total. You'll find a lot of them are pick up only (understandably...) but if you climb often and travel it's easy to coordinate.
I might be able to borrow a pad so could get away with not having to buy one for now. I tend to rope climb outdoors and boulder indoors so a pad isn't high on my list of purchases, but we need plenty for this Font trip as there are 12 of us going.
I've emailed Grivel for more details about the mat. It just seems a bit too good to be true that it is 12cm thick, only 3.5kg and £90!