Tunnie .. have a look on fleabay under ration packs ... loads of them there...
And contrary to popular belief .. the "quality" is extremely high .. as (1) they are designed with a very long shelf life, and (2) they have to give the energy a soldier requires in order to fight.. not just survive ....
Correctly prepared some of them actualy taste reasonably decent as well.
If memory serves me .. the 24 hour packs come in about 10 or 12 "menus"
HTH 
I did see ration packs on eBay, but felt they were quite a lot of money, almost much as a nice pub meal :-/ They are popular on GS forum too. Looks like they are worth a go!
A pub meal is one meal .. these are basically 3 meals and 2 snacks .. a full 24 hours worth of food ... makes them somewhat better value when thought of that way !!
Edit : done a little searching .. there are 12 menus ..
Menu 1
Bacon omelette & beans,
lamb curry & rice,
cream of tomato soup,
chocolate pudding in chocolate sauce,
tuna in light mayo,
isotonic lemon drink,
golden oat snack bar,
chocolate drink plain.
you also get in every pack ..
Instant coffee,
Oatmeal block,
Tea instant Black
Biscuits fruit filled
Beverage whitener
Biscuits service brown
Sugar
Chocolate bar
Boiled sweets
Yeast extract
Tabasco sauce
Jam
Chewing gum
Fruit grains
Matches waterproof
Water purification tablets
Paper tissues
HTH
