I used to always have tiny ickle zip-seal bags made up, containing a teaspoon of the water flavourings (Summer Berry, Sunshine Orange and the Savoury Veg) all marked up clearly, to hand out as "taste-trials" for any client who wanted to try before they buy. I agree, that to pay out £6.40 for a whole tub of something you're not sure if you'll like, can seem a bit much for some people. I've stopped that system now, as way too much of a faff, and looked like a cocaine dealer measuring and bagging up the goods! However, will still happily make up individual tester/s for anyone who asks for it! Not sure if your CDC will, but you could maybe ask? He/she may even start offering to others if you suggest it!