I tried all the other suggested methods to no avail, and then after months and months one came in on my eBay watch list. It's not in the best condition, but it's way better than mine, and wasn't too much $$$.
A 91 will fit my 88 right? Here's the auction:
eBay Motors: NISSAN TRUCK / PATHFINDER steering wheel w/ horn button (item 180186350076 end time Nov-30-07 10:40:01 PST)