WHY I shop at thrift stores; saved $171.00 today. YAY

The Gazelle Freestyle 2 glider ($199.99) works your arms and legs and torso in a striding motion that combines the feel of a cross country ski machine with your kid’s swing set. You can use it at either the slow walking pace or a full out running stride. I bought it for $26 today at a thrift store. I needed something with low impact and find stationery bikes boring and the seat begins to bite into my butt. This glider lets me work my arms and legs. I can go slowly or speed it up. I can "
ride" it while listening to the radio or tv. Love it and I saved $171.00. Why would anyone shop for full price? Puzzles me.