These lift supports are now available at liftsupportsdepot.com, a division of the same vendor. I purchased a pair for a 2000 RX330 for $65 + shipping, ordered them Friday night and had them Monday morning. Installation took 10 minutes. Seems to be an excellent product, at a small fraction of the dealer price.
I had been fighting the rear hatch for a couple of years until I stumbled across this forum and was led to this solution. Most excellent!! I'll be back...