[Bagga]

In the UK, Early Learning Centre shops do a nice range of flashcards, and there are branches in most big cities.

I use "kid's" flashcards with adults too, which makes them even more useful. After all, no matter how mature and pompous you may feel, if you don't know the word DUCK, for example, you are still "young" in English, so you shouldn't be offended when I show you a sweet flashcard of a duck.

Or on one memorable occasion, when I brandished a plastic rubber duckie from my bathroom, at a group of adult beginners. I bet they will never forget the word DUCK after that, though!