The cost of an ipod microphone will differ. It all depends on the quality of the microphone you want to purchase. Price will range from 10 dollars up to about 50.
Cydia costs $9.99 on iPod touch.
The iPod Touch 8gb costs 199$
In iTunes (it doesn't matter whether it's through the iPod Touch or not), videos cost $1.99.
about £90
350000
$600
$259.99
nothing
199.99
About $180.
189.00