Flat rate boxes wont work for you. They are too small. I do a lot of shipping and the best rate is Parcel Post with the US Postal Service. It is a ground service that takes 2 to 9 days. If the delivery is close by, within your current shipping zone you can sometimes ship it with Priority Mail for just about the same price.
Good luck,
Harry
Originally Posted by Painiacs
For me- post office!!