The front is in two parts, the splitter does come off, you can see the join in the pic below (I had mine split for the respray). Wouldn't think anyone would be selling just the splitter though?
£440 inc, painting, fitting & VAT for a new one - If they're within range, I'd be handing over my card now - it looks like MStyle are offering a very competitive rate for painting and fitting (I'd assume that that rate's only available if you buy the part from them)
If you manage to get one second-hand, unless you're very lucky, it'll be a different colour so it'll need prep, respray & fitting and the amount you'd save compared to the cost of that new one is likely to be small compared to the extra faffing about required (shipping/collection/paintshop/fitting)