filleting tray/bait table

hi all,i was wondering does anyone know where you could buy one of these filleting tables,these are the ones used to prep bait or do a bit of filleting on,they fit into the rodholder,usually seen in the back of boats,any help greatly appreaciated,dezzer....................

http://www.rivermarinesupply.com/xcart/ ... luded.html

They are advertised also in many of the angling magazines.

I was looking at getting one but if I recall they are 90 quid so I made one instead.

Mariek