if your just going dual map tunes then PowerTune will charge $1300 for 98 and e85 tune
with my setup, I got the e85 sensor plus the I/O plugin for the Haltech read the e85 signal
with the Flex flex setup similar to Paul's its another $1400 on top which includes the e85 sensor, the plugin for Haltech, labour to hook it all up then extra tuning for various levels of e85
$1800 for haltech
$1300 for dual tune
$1400 for flex fuel setup
$4,500!!! its not cheap lol