Well, they normally run about $1k new, depending on whether it's a 42" or 52" shaft (52"s are a bit more expensive by about $40).
Cabelas has them on sale right now for $900 / $940 (42" / 52"), plus about $65 in taxes and their $20 shipping rate to me.
If the trolling motor is in very good to excellent condition - both mechanically and cosmetically, I normally ask a little more than half of retail price (with taxes) for a used motor with a few years on it. Before the sale, I probably would have been asking about $550 to $600 for a good one. Right now, I'd probably be looking at about $475 to $500.
Shipping UPS residence to residence is fairly expensive on such a heavy and large box. If you can ship business to business or even residence to business, the price of shipping is usually cheaper.
All the best,
Glenn