Yes, you can buy a Dacia for below 20kEur, but even those have gotten far more expensive lately. It used to be that around 10 years ago, a Dacia Logan (typical station wagon family car) could be had for 11kEur. Nowadays the comparable Dacia Duster (SUV instead of station wagon, but somewhat similar slightly smaller internal space) will set you back 18kEur. Most of this price hike is claimed to come from mandatory electronics like eCall, collision avoidance, fatigue sensors, more complex bodywork due to crash requirements, as well as more complex engines due to emission controls.

With your quoted Renault EV models, you really have to be careful, often they don't give the full price but just the price without battery. The battery has to be bought or rented separately.