Counter Intuitive Pricing Model

[rsutter]

Hello All,
I recently shopped on-line for sprinkler heads.  I found what I was looking for at https://www.amazon.com/dp/B00004S1TY
If I bought one sprinkler head, the price was $1.67 per unit.
If I bought two, the price was $9.59; That's $4.80 per unit.
If I bought three, the price was $11.24/$3.74 per unit.
If I bought five, the price was $15.39/$3.08 per unit.
If I bought ten, the price was $27.45/$2.75 per unit.
If I bought twenty, the price was $51.20/$2.56 per unit.

My solution was to buy one at $1.67, then buy another at $1.67 and buy a third unit at $1.67
I don't understand the logic behind this pricing model but suspect that it's tied to an irrational shipping rate structure.

Ralph Sutter

[rsutter]

Hello All,
Today I went to the same web site and purchased 10 spray nozzles (Orbit 54039 Plastic Shrub with Brass Nozzle, Black) for $1.29 each/10 for $13.80 with taxes and free shipping
See https://www.amazon.com/gp/product/B00004S1TY/ref=ppx_od_dt_b_asin_title_s00
Ralph Sutter