They often come and go on eBay. I've bought Procat shells, under trays and belt covers from TBG...
http://stores.ebay.co.uk/TEAM-BLUEGR...id=p4340.l2563
I'm currently using the Kamtec shell but they don't do the under trays, but TBG do...
http://www.ebay.co.uk/itm/1504191390...#ht_500wt_1128