I called for service on my furnace. The tech was ...

I called for service on my furnace. The tech was out in about 1 hour. He correctly diagnosed the problem in about 10 minutes but said he needed a very difficult to get part and the repair would cost $297. He said he would order it and get back to us. I called the service number about 2 hours later and they said the part was ordered but they had no idea when it would be in. Since it was supposed to get very cold the next day, I googled the part number and found it for sale in about 10 different locations here in Dallas. I went about 2 miles and bought it myself for $35. Then when I got home I installed it my self. It required inserting 1 screw and plugging two wire connections together. So, A-1 was going to make me wait several days and pay $297 for 20 minutes worth of work by their tech and a $35 part. Seems literally like a scam to me. If they had visited my elderly parents and tried this stunt, someone would be going to jail.