Mellotronists

Hello all,
I have what may appear to be an odd question, but I was wondering if
anyone here has noticed certain times of year when trons become more
readily available on the market? I ask because I've noticed over the
last nine years or so on ebay that rarer, high-ticket items tend to go
up for sale during what we in the US often refer to as Tax Season - or
as I like to think of it, the time of year when I'm scrambling to raise
funds to pay my taxes which I have again somehow managed to
undercalculate. If there is such a season for trons, I want to be
ready with funding solidly in place (this year I managed to not owe on
taxes for once). Any info, tips, secret knowledge, jokes and/or insults
about my intelligence, character, breeding, etc. will be greatly
appreciated.

best,
john b