Probably the NIPPON single, except that I'd want the B side to complete my collection.
Other than that, I regret buying 3 of the Tokyo Jihen albums (color bars, Tokyo Collection, and Daihakken) where I got the Korean release instead of the original Japanese one. And maybe the DVD concerts that were later re-released on Blu-ray (although I certainly didn't regret buying them at the time).
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