i'd say around 15 bucks or so.....maybe a bit more.
from my experiences.......the post office has been more reliable to use. ups has lost something that i've shpped and also something that was being shipped to me (never did receive it). the post office has never lost anything of mine.
generally speaking...ups doesn't like to deal with the general public. that's why they have contracted with all of these ups drop-off points at places like office depot and other places. that also adds to the costs. for me.....i've found that the post office is generally cheaper and easier to use and shipping is quicker than ups usually is. first class mail (if the item is small enough) is cheap, cheap, cheap. priority is a little bit more, but it usually ships pretty fast.