Since you're in the UK, this should make sense:-
A wet pallet will cout you around £8 for a good one.
Thats the price of a great Crispy Chilli beef around here at least.
Eat the Chilli Beef (or chinese dish of your choice... its a necerssary evil... hard life) and clean the plastic dish and lid.
Layer in a little blister foam, or half a dozen layers of J cloth.
Wet the foam /cloth layer. It will take practice and trials to find the right dampness depending on the paint and foam you're using.
Cut a piece of greaseproof paper to the size of your pot, and lay that on top of the wet foam / cloth.
Good to go.
If you're leaving your pallet for a little while, wet the foam a little more and put the lid on the pot. It'll keep for up to about 3 days like that!
I've got a P3 wet pallet I bought off ebay too. Cost me £7 delivered, but I flip between that and my homebrew one depending on what comes to hand easily - there's no great difference eccept I ate Chinese to make one of them

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Cheers,
Paul "TuffSkull" T.
http://hobbybrush.com - My New Website, with thousands of painted Mini Pics :)
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TuffSkull's notepad- My Old Blog on Wargames Wiki.