Gave a homemade kebab a go and just had it for tea:
400g Lamb mince
Tsp Cumin
Tsp Thyme
Dried chili flakes
A few cloves of garlic
Puréed onion (I just cut it up and put it through a garlic press)
I mixed it all together well and squashed 2x the above into one mince tray (removing the paper bit at the bottom) and covered with cling film in the fridge for 24 hours.
I couldn't be bothered with any fancy, so just cut the loaf up into portions (ending up with essentially a thick slice of loaf) and ovened it. Once cooked, I sliced it up as best I could and put in pitta with lettuce and garlic mayo (mayo, garlic, salt).
Really nice; I'm not one for the elephant leg kebabs, but like them when done properly.
In terms of cost, 2x400g lean lamb mince was 2 for £6 and the other costs are negligible really. I cut mine up into 4 portions, which would do 3 or 4 pittas with plenty of salad. Not the same quantity as a kebab shop, but sufficient IMO and much nicer. Quite filling too.