Yup, that looks like SM18 tray from KR:
http://krmulticase.com/product.aspx?id=SM18&t=tray
Unfortunately, judging by their website only case that the beast fits in is their prestige case:
http://krmulticase.com/product.aspx?id=PRS-S&t=case.
Cheapest options would be to build your own, but that requires access to some woodworking tools. Or find out if your local shipping center has some huge cardboard boxes for sale.
Accessory case for music instruments / gear would otherwise be nice, except that the foam is slightly too large for the standard sizes and the larger ones or custom mades are probably as expensive as that prestige case from KR.
Assuming you're from
UK, that foam should fit a 70 litre case from Really Useful Products:
http://reallyusefulproducts.co.uk/uk/html/onlineshop/rub/b70_0litre.php (internal dimensions 710 x 545 x 190). They're quite sturdy.
Or go for the big Ikea Samla if that's easier, thought that one is much larger and thus harder to move.