I think that figure is way to low, at least if you trust this source:
Eurofighter’s Rough Ride in Austria (updated)
"Eventually, a grand coalition government was formed that pledged to resume negotiations with EADS, after a response from Eurofighter GmbH set Austria’s cost of cancellation at EUR 1.2 billion in return for zero aircraft. While those negotiations continued, the first Austrian Eurofighter flew, #2 was rolled out, #3-6 were in final assembly, and the rest kept advancing into partial assembly. Eventually, a EUR 1.63 billion compromise was set for 15 Tranche 1, Block 5 aircraft and support services."
Thats about € 109M per unit.