Calculators you regret buying?

[aurelio]

I regret to have bought my first HP calculator on ebay, starting to play as a "little collector", that it's quite different to be simply an utilizer of them,

for the same reason I could say that I've regret so to have no bought a lot of calculator, when I had the chance to, expecially the ones lost in a last minute competition auction

I reply only here to both the reladed topics, just to save money for the next purchase