The cheapskate option for large weepy wounds is to get some decent quality sanitary towels (for those without a working knowledge of such things, you're after something at the more expensive end of the shelf that's relatively thin but large and high absorbency, wings are good, perfume bad) and some micropore tape, and use your Blue Peter skills to manufacture dressings of an appropriate shape. The magic upper layer does the Right Thing of allowing fluid through without sticking to the healing skin.
I'm sure hydrocolloid is a better option, healing wise, but this is an improvement on buying large quantities of traditional dressings in sizes you local pharmacy doesn't stock. Particularly if the wound is in a position that dictates frequent dressing changes for, erm, sanitary reasons (DAHIKT).
