You could use CIS Flight.
CISflight IFR - ECAC countries, one week | CIS-Computer GmbH
Download all of the AIP for each country and open in GoodReader on the Ipad. Just make sure that you do all of your downloading in the 1 week that the 44 Euro payment covers.
The data will become out of date, but if you aren't using it in the aircraft, this won't matter very much. Just pay another 44 Euros when you want the newer data.
No US coverage though