Rechargeable Sonicare toothbrush for $12

I went to the dentist for the first time in about 10 years, because I had a cracked tooth. The dentist told me my teeth looked good but said I should get an electric toothbrush. I asked what kind, and he said he liked Sonicare. I got one for about $60, but now I see Amazon has one one sale for $12?. (there's a little green coupon on the page.)