I always use CBI in Niagara Falls, NY. Its 6 bucks a package with no time limit. Great people, and always reliable. It is literally a 5 minute drive passed the boarder. They are also a certified UPS shipping location so if I make a sale on bf.c I always ship from them as well.
As for declaration, the boarder is pretty lenient on pricing. I cross minimum once every two weeks with a couple buddies to bring stuff back. Anywhere from $300 worth of goods to $3000, and we have never been questioned on values. You can definitely lower your declared prices on used items, just don't go over the top with it.