Can anyone reccomend a retail source for some aged Leoville las Cases? I'm looking for a couple / few bottles of the 1986 and 1990 respectively, but I'm a little leary about provenance and shipping.

I'm considering John Hart and The Wine Club, but I would greatly appreciate any thoughts or experiences.

try sokolin.

I will second Jones' recommendation. I purchased a bottle of 1927 Fonseca there which was absolutely fantastic. I think that alot of the bottles like this are from their customers who store their wine at BBR so provenance is guaranteed. According to the guy I purchased the Fonseca from it had been at BBR since "year nil".