expensive..try WWII reenacting
Sure, you can get started with some basic repro gear and a rifle... about $400 for a brit impression, about $900 for a US....but then you branch out to early. mid, late war.. summer, winter, specific periods and theaters all had a unique mix of equipment... then to the dress uniforms for the parties..then the period accessories (razor, toothbrush, pens, watch etc)... then other countries ( I do US, Brit, Canadian, Russian, Polish and partisan)..then the pieces to your particular impression (I do combat engineer so thats repro demo charges and original engineer pieces)... then all the period weapons for each impression.... then big tents....
Then you start on vehicles..... first a jeep, now my eye is on a half-track..........hell I have a WII airborne handcart, basicly a mini wheelbarrow, thats worth over $2000...for a freakin handcart!