The most updated data available at spaceflight.nasa.gov show that on day 361 there was a reboost:
IMPULSIVE TIG (GMT) M50 DVx(FPS) LVLH DVx(FPS) DVmag(FPS) IMPULSIVE TIG (MET) M50 DVy(FPS) LVLH DVy(FPS) Invar Sph HA DT M50 DVz(FPS) LVLH DVz(FPS) Invar Sph HP ----------------------------------------------------------------- 361/03:07:48.737 -1.0 2.1 2.1 N/A -0.5 -0.2 221.5 000/00:05:37.474 1.8 -0.1 215.8
In the same site, I see the lines:
Vector Time (GMT): 2018/360/12:00:00.000 Weight (LBS) : 949740.4
and
Vector Time (GMT): 2018/361/09:08:00.000 Weight (LBS) : 949512.8
the mass loss is about 103 kg.
If I recall correctly, I read that the cost to bring 1 kg of fuel to the ISS is about 10000/15000 dollars.
Can we say that that reboost cost about 1 million dollars?