That end bit of the spray bar thats missing is really difficult to get hold of, you would have to buy a whole new bar. Would be a bargain for 99p though, not a bad filter I have 2, but I prefer the all pond solutions one.
The end plug is not a big issue as you just need to put silicone in there about 10cm in length then give it 24 hours to dry.
Well thats what I did as the plug I had in my tetratec 1200 spray bar was loose so i binned it and just plugged it up as I described and its been holding fine now about 3 months and counting of course I would recommend aquarium safe silicon only.
I would say around £15 tops, buying the media (cheapest place zooplus) would be around £20,if you decide to get another spraybar with end thats around £10.These filters are around £60 new,if it had media it would be a good buy for less than £10