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I’ve been tracking this and this is the cheapest I’ve found for 4 & 8 zone. There is a clipped coupon on the product page
Rachio 3: 4 zone: $ 147 with $ 30 clipped coupon = $ 117
Rachio 3: 8 zone: $ 175 with $ 40 clipped coupon = $ 135
Rachio 3: 16 zone: $ 250 with $ 50 clipped coupon = $ 200