I paid $200 for '00 FXST trees in very nice shape & the tubes to go with 'em. Didn't need the tubes, but the right set of trees can be tough to find. Figure I can sell the tubes to offset a bit of the cost. Only thing "more better" would've been FXDWG trees, but the only sets I found were for the -'99 bikes & I wanted to retain my neck lock.
I think I did pretty well scoring deals on all the major parts on ebay, but was surprised at how quickly bearings, dust seals, oil seals, fork re-build kit, etc. add up.
Fortunately, I have a great local dealer & the parts guys are having fun, looking up part numbers & helping me get everything together.