It depends on who is selling the I Pod touch and how much they are selling it for.
they do not make them anymore, but you can look at the price range on Ebay or Craigslist
Cydia costs $9.99 on iPod touch.
The iPod Touch 8gb costs 199$
Your best bet would be ebay. Otherwise, its almost impossible to get an ipod touch THAT much lower than the original price.
199.99
$600
$50.00
nothing
about £90
364.34
35.99