You could just get a tarp to fit off ebay, thats what we do with our Outwell Bearlake I think the footprints are overpriced for what they are tbh and a tarp does just as good a job.
I got a footprint for my Idaho XL (and the extension) less than a fortnight ago from Discover, didn't have them in my local store but couriered them direct from their Darlington (I think) branch. Might have been the last extension but not sure about the footprint. It was £39.99.
------------- Redjeni
April - Filey - no tent :-(
June - Carlton Minniott
July -Spain (no tent)
August - Carlton Minniott and others to be planned!
I use a big sheet of heavy duty plastic that I found on a building site I was working on. I'm getting a new tent and still wouldn't consider getting the footprint for it, as what I have works perfectly and footprints are overpriced for what they are.
Try a pond liner cut to size or a cheap tarpaulin (argos have one £9.99) or two of them if they're not big enough.
If you're using a tarp instead of the maker's footprint, cut it to size (or fold it under) the tent's perimeter so that it's an inch or so smaller all round. If it overlaps the tent it risks channelling water under the tent's groundsheet. Even though the groundsheet will have a much higher HH than the tent, you're walking around on it and if water gets under, it risks overpowering the HH resulting in water coming through. Just saying....
i dont like cleaning my groundsheet so if it gets too dirty i just bin it and buy another one.i have a montana outwell 12.
go to http://www.tarpaflex.co.uk/ for ground sheets you dont need to buy the orginal footprint.click on Economy Tarpaulins and work out your nearest size..