I'm not going to justify the price you were charged, but parts for a 1961 Cast Iron torqueflite are probably not the easiest parts to find, mainly because not many people are making parts for 56 year old transmissions anymore. The parts catalog I have here lists no transmissions built prior to 1962. I know a company called Fatsco specialises in old transmission parts and maybe you should contact them and see what they have and what they would charge you for the parts the shop put in your transmission. For all these old girls you ain't going to find these parts at your local NAPA store.