Jodie - yup they are expensive ( but still cheaper overall than using disposables!!!)

I haven't found a true AIO that I am completely happy with - more happy with my AI2's - I am in love with my itti bitti d'lish - so lush!!!! Plus you can get seconds for $22.00.

You can always go to buy for baby (google it) and buy secondhand ones.....

ETA: I class my IB's as AI2 cos I like the snap in ones. but you can get sewn in ones that are basically an AIO... they dry quite quickly too