u/-UmiDgaf

Hello I'm a little new to selling on ebay. I'm listing a few shirts that are 8oz, 5x2x5 will be in poly bags, and my shipping is coming out to out to $7.90 - $9.45. While others sellers are telling me there shipping price for a 8oz shirt is $5.00-$6.40. How are they shipping the shirts at a cheaper rate? I'm also using usps ground advantage.

I'm also checking a few other sellers listing of the same shirts I have and there shipping is less than mines. Sorry for the dumb question I just don't know if I'm doing something wrong when listing.