I'm new to the whole 802.11 game and am not sure if this cable is used for APs, but I found This while looking for a local place to buy N connectors. They have a 4foot 9in TNC/N male cable for 3 dollars. I'm not sure if the TNC is reverse polarity or what, but thought that someone might find it useful. From the pic, it looks like LMR240 cable.
Only thing is the place requires minimum 25 dollar order.
Good thing is they also have Female N connectors too so if you wanna pick up a bunch it might be a good deal.
-patchy