best prepaid SIM for european data roaming

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From Vodafone Ireland

If you're a Prepay customer
You pay daily as you use the service, and you only pay for the days you use. Our standard rate is 99c for a 50MB daily usage allowance, and 0.001c per KB (or €1 per MB) thereafter

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What about roaming and Mobile Internet?

Vodafone Mobile Internet is the same price when roaming abroad as at home. The service will be accessible from any country where we have a 3G or GPRS roaming agreement.

This is less than I pay with Yoigo prepay in Spain. Very likely this is not full net, but Voda portal, and using full net would cost more.