Thanks for the leads, guys! However, warning about Uship: ufokillerz, you RECEIVED freight from Uship, but if you are the shipper, beware. Uship is a broker. I got a quote via Uship that was $435 for a pair of Acoustats. The shipper linked in the eBay posting quoted $229 when I plugged in my zip code, BUT stated "no insurance available". The only quote I received via Uship was the $435 figure. The quoter is actually a company that takes RFQ's and shops them to several actual freight carriers, then supposedly forwards the lowest quote to you. Think about it: this is the second broker in the supply chain. He has profit in the price quoted to me; Uship has profit in that price and of course the actual carrier has profit in the price. I think the max realistic freight charge would be somewhere around $300.
Anyway, I think I'll use the cartons' dimensions and weights and get quotes from the carriers in this thread.