Are you referring to VG/PG? Are they really that expensive for you? That's wild.
Also, in the GP comment, you mentioned the cost was 400€ but here you're saying 56€. Are you talking about different things?
Quick Googling suggests I'd pay less than 30 euro for a liter of VG. What about for the nicotine concentrate? I'd pay about 20 euros for 100ml of 20mg/ml concentrate.