I used to find that Ryanair had a tendency to lowball the aggregators, and then whack on ridiculous extra charges at the end of a tedious and lengthy purchase process. Have they stopped doing that now?
http://www.bbc.co.uk/news/business-18718556
Also last month they were forced to remove the 'you have to pay €12 to pay with a Visa card' policy, so now the fee is 2% for all cards. However, they now make the admin fee mandatory however you pay :)
http://www.thisismoney.co.uk/money/holidays/article-2240292/...
Add on the baggage fees, landing fees, priority boarding fees, tax, credit card fees, etc. and the price isn't so impressive.