how to know what is Insert charge?

[vopo_kudam]

I just lised one small item, ebay system said " free" insertion. Immeadiatly tried another similar itme, got insert fee $2.00 ( two dollars). Why the difference ? how can I find out what I am paying ( extra) for ? 

[*sparklz*]

You have  Fosters Grand Prix 1990 Beer glass in the sub title and there is a $2 fee for that