I'd like to apologize for the uploading flood(?) I've committed with the bkub covers I've been upping. I've tried my damnest to find the best possible sources for the covers that I have upped, and while the overall quality may be a tad questionable, I can only hope that this will at least prompt some interest in finding higher quality versions.
If not though, I just have to improve my Google-fu, I suppose.
Turns out there was a version on Pixiv. I feel silly.