At $25 from Walmart, this is the cheapest way to get a real Sonicare in your bathroom. Bare-bones but from a trusted brand with widely available replacement heads.
If $50 still feels like too much, the Sonicare 1100 is the move — it's a legitimate Sonicare at half the price of the 4100, and it gets the job done.
“Sonicare has a $25 model sold at Walmart (Sonicare 1100). Replacement heads can be pricey but I try to get the cheapest ones (Sonicare C1).”