All those of you saying you can get 32G and the likes in the supermarket, is this a recent thing?
Because I'm a 32F and admittedly haven't bought bras from anywhere except Bravissimo in years because everywhere else on the high street is a total waste of time and don't have anything in a 32 above an E cup.
But to answer your question OP, no 32G is not an unusual size, it's just that except for the enlightened few, manufacturers don't make bras for average sized women and many people have a completely outdated and skewed idea of what any particular bra size actually looks like - see the endless stories about slim and only slightly busty celebs having 34D or 36DD bra sizes when in reality they're probably more like 28 or 30G-K.
I'm a 32F and I'm a medium sized woman with medium sized breast and I should be able to have my pick of endless bras in any shop, but no, I have to go to a specialist.
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But on the matter of cost, it really is something that is worth spending extra on and it absolutely is better to have 2 decent bras from Bravissimo than half a dozen badly fitting ones from supermarkets etc.
The buying experience is so much nicer too. Instead of taking a load of bras in, finding none fit and then having to get dressed and go find some more, you just sit there in a dressing gown and the fitter goes and picks a load which experience tells her will fit you properly and as if by magic they do (even if the size is the same, different styles don't always suit all bodies and not all 32Gs are exactly the same size).
Ask for vouchers for your birthday and Christmas etc, or buy one bra from Bravissimo and then look for more in the same size and style from online sales etc.