The reason we do not offer PO Box shipping is that people will try to order cages and large items to PO Boxes which cannot be done. 

The time we would be spending on contacting customers of this, order cancellations, etc would be more than we have the staff to handle. 

Also, on large shipments the cost of USPS is considerably higher than for FEDEX or UPS. 

Small orders of 1-3 pounds at most can be sent USPS at our expense on orders of $45.00 or more. Over that weight we go with the lesser cost shipping by FEDEX or UPS. 

However we can ship via USPS if we are informed and we discuss the cost of shipping when the order is placed or before via phone or email.