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Buy two Reach toothbrushes 2/$5 and get back one $3 Register rewards.  But there is also another unadvertised register rewards deal on reach toothbrushes:

Buy two Reach toothbrushes, Get a $1 RR back
Buy 3, Get $2 RR back
Buy 4+, Get a $4 RR back


Thanks to CommonSenseWithMoney for sharing