BlackHatCoiner, I don't know where you're located, but I can print something like this for free for you mate. 
Dear lord, I had forgotten to respond to this kind offer... I've already used to the orange pill now, but thanks! 
So, apparently, the dice results aren't calculated as I thought, with 1.66 bits in each roll.
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One thing I also don't understand is how the rolls are 50/99 exactly. Doesn't each give 1.66 bits of entropy on average?
Instead, they choose to SHA256 the result, which looks like "25516341...", and then convert the hash to mnemonic. At least that's what I understand from their source code. So, 50 rolls, if the dice is fair, provide 6^50 bits of security*, which is about 3 times 2^128. However, because I'm completely paranoid when it comes to dice fairness, I've chosen to roll it 99 times. Just in case.
*An ECDSA private key provides 128 bit security, though.