Have a home made box. 16ft total length. 8ft flat box, 3 ft tall and an 8 ft down box, 3ft to 2.5 ft tall. Made of wood, HDPE on top, steel coping on side. It is disassembled in the basement right now. Could assemble it for you and take pics if there is interest. Don't know what I want for it yet. Paid well over 100 when I made it two winters ago. I am in college now so have no more use for it.
Local pick up obviously, but would be able to deliver it up to NH when I go back to school