rare

A while back I got into the idea of using non-standard, or even rare, woods to age/mature whiskey. The foray that put a pause on that was pawpaw wood, which has acetogens and can be pretty doggone deadly. I want to try acacia confusa wood (because, ya know, fun to try) but my big question is...

Hi all I need to buy a birthday present for my Dad, who is an avid home brewer. Was thinking of getting him a selection of rare/unusual/hard-to-find/exciting hops - but I have no idea what to get. Looking at a few of his recent beers, he has used apollo, cascade, citra, cashmere, mosaic...