This is a revised post. I have added UPS as another option for delivery on the site. I am hoping that customers will choose UPS if the price is right for them because I believe UPS will offer better service over USPS. I am, however, still offering priority shipping as an option because it is simply the cheapest way to send a small package and I don't want customers to be burdened by shipping when making small purchases from the store. I have, however, removed Parcel Post as an option. Parcel Post, unfortunately, is just about the slowest form of shipping around. I recently had a package I shipped on the June 16 arrive at its destination on July 3. This is simply unacceptable. Although the customer saved about $2, I don't think it really seemed worth it as they waited and waited for their package to arrive. Also, the longer a package is in the mailstream, the higher the chances are the parcel will become lost or damaged.
One of the benefits of UPS is that the heavier the package, the more likely it is to cost less than USPS. And, it's completely trackable. You won't be wondering where your package is, you'll know! And, it will get to you in five days or less, guaranteed!
If you have any questions, please let me know.