anyone knows?

The first one costs $1.90

The second one costs $2.90

The third one costs $5.20

why is it 5.20 for the 3rd? dont we get the average since it starts from 26? i mean ----> (3.40+5.20)/2

One of the dimensions is too large 35 cm is bigger than 32.5 cm so you have to use the larger shipping size (26 x 38.5) price 5.20