mailing packages from the business center

[minnie4me]

received some info on mailing packages home from WDW, some say you can do it right from shops, but shipping is expensive. Someone said to mail from a business center and it is alot cheaper, plus can put everything together. listed resorts where a few business centers were, the GF or CR would be closest as we will be at Poly, has anyone ever mailed from either of these? where in the resort is it located? Are they going to give me a hard time? thanks for any info