OK, so my last sax recommendation caused rtucker some grief with what appeared to be a faulty vibrato script. My apologies to Rick. In my defense, I did say I'd only heard the demos, not that I'd actually used it.
Maybe this
link will help make up for it: Embertone's Sensual Sax. This one's perhaps a little less versatile but very nice-sounding. It has very few controls: a choice of legato, stacked or polyphonic modes and a big knob in the middle labeled "SEX". Don't get your hopes up, it's a one-knob vibrato/reverb adjustment.
Best of all, it's a mere
20 bucks, which just happens to be my take-a-chance threshold.
Full Kontakt 4.2+ required. Sorry, for $20 you're not gonna get the free player.