Thank-you all for your answers. You have given me many choices. When we camp on the Oregon Coast, we usually camp at state parks as Oregon's are superb and not too many places on the coast to boondock unless you go inland. I didn't really think about having it shipped to an RV park. We did use the Sea and Sand or Sea and Surf or whatever (a Good Sam Club facility) north of Depoe Bay once when Beverly Beach was full. Our favorite state park is Fogerty Creek which has no camping and the Good Sam park is a mile or 2 away. There is always someone there so I can ask them if they would accept a package and sign for it. They may not want to be responsible for it. I kinda got the impression that they didn't bend over backwards much.
If not, then your suggestions about other places like the Walmart, Lowes, Target and even the Washington Square Mall by Sears Tire would work. And, I am intrigued by Francesca's suggestion of the Baldrock Rest Area that has the 50 state trees. That sounds like the kinda off beat places we like to see.
Thanks again for your suggestions. Happy St. Patrick's Day!