Yes friends, it's true.  Many people hear Puerto Rico and think it is international shipping.  Wrong!!  PR is a US territory and as such, all USPS rates applies in there as well as with any other state.  PR is considered domestic shipping by USPS regardless the distance.  There are two size of boxes in Standard Flat Rate service.  Go to this USPS web site and find Standard Flat Rate boxes in calculate postage.   Many of the parts sold in Ebay can be sent in one of two size boxes available free at your postal office.  If it fits inside those two boxes, it can be sent via Standard Flat Rate for only $8.10, regardless the weight and the best of all, to any US state or territory.  This includes the lower 48 states, Alaska, Hawaii, Guam, Puerto Rico and US Virgin Islands.  If it does not fit in one of those two boxes, you can use the zip to zip calculator of USPS at USPS website and you will see there is no significative difference compared to other US states and you always can ship via Priority.  Never use Parcel Post service to Puerto Rico.  The difference in price with the Priority service are only cents, but the difference in transit time is a lot.  USPS claims Parcel Post service takes 2-9 days but that is never true.  It will take 3-4 weeks, this will cause buyer to file claims against you thinking package will not never arrive.  Also, UPS or FEDEX service are available to PR but these are private companies and their rates are very high to PR.  So, please, add PR to your listing, so we can be in your client list.  Thank you!!

A. Ocasio