I live in Lithuania and that also appears to be the case here. The cheapest mobile plans from the main operators start at around 8€/mo for 1GB data with unlimited calls and texts. To be fair I would say these type of plans are actually quite expensive compared to the rest of Europe. But there are plenty of data-only plans which work out a lot cheaper.

The cheapest provider sells unlimited data for 2.90€/mo, but the speed is limited and they are a smaller player so their coverage is too. From the big players, truly unlimited data with no speed caps is 20€/mo (the largest capped plan is 120GB for 11€/mo, 0.09c/GB). And of course they have discounts if you have other services from the same provider.