I don’t know what your local Nissan dealer told you, but you can buy the wheel bearings for your S13 separately from Courtesy Nissan (
www.courtesyparts.com ) Part number# 43210-AA100. Not sure about the front but the rear bearings are $98.70 each and all you have to do is have any local machine shop press them in for you and presto!
I bought the set of rear bearings thinking they would fit into the 300zx hubs for my 5 lug swap but it turns out although the are just about identical size and all the holes line up, the 300zx bearings have a tapered hole and use a rubber seal and the s13 bearings are not tapered and are sealed bearings with no rubber seal. so now I have 2 rear wheel bearing paper weights cuz the s13 bearings won’t fit into 300zx hubs. Check out the pics, if anyone has any info holla.