I bought this electric scraper sharpener late last season. It's totally unnecessary and an insane expense; I hesitated for a while trying to justify it. Now I have it and it's totally worth it; no regrets. Having a super-sharp scraper every time makes things SO much easier, and just adds to the pleasure of waxing.
http://www.tognar.com/mantac-electric-wax-scraper-sharpener/
http://www.tognar.com/mantac-electric-wax-scraper-sharpener/