Depends on whether you need a separate carrier plan just for that. Most people already have a decent, unlimited data plan on their mobiles, which at least in Finland start from 5€/month. Although, that only buys you 0.5Mbits connection, so upgrading to 10€ plan for 2Mbits might be required. On the other hand, a separate SIM with no calling or SMS functionality will get you 10Mbits for 10€/month.