peppp, I got myself a pack of lithium which moves me over 50km any day for less than 4000e including bms and charger. You'll get that range with car weighing about 1000kg and less than 10kWh of batteries.
See
Home - GWL/Power - Your Complete Power Solutions - EV-Power.eu for european supplier of Thundersky batteries. The more you buy the cheaper it will get.
I used miniBMS and TCcharger (ElCon) bought from manufacturer directly. I remember it being something like 300$. Now if you could get motor, controller and wiring cheap you'd be pretty close to your goal.