You come with good news OB
E-visa firms usually take some more bucks as an administrative charge other than the visa fee, so now both disappear there are some bucks to save...
and less border run and less hassle...
I see only positive things...
I hope you noted, this is for Sri Lanka?
I'm guessing, if you do a border run there, your feet get wet?
Also, if the fees there are similar to Vietnam, this might only be referring to the government stamping fee.
You might still need to pay an agent if you don't place your application directly through an embassy or consulate.