Price Of A New DE409 Dryer
Probably between around $339 and $419.
This was a good middle model dryer for MT but would be among MTs least expensive dryers at the time it was built.
If you are looking for a good dryer that you want to keep going the rest of your life I would start with a better dryer, such as a WP or KM dryer with top lint filter built from 1975-1990 [ WP built dryers after 1984 were much safer with the added thermal cut-outs that protected against overheating and possible fires ]
Not only is drying performance much better with these WP built dryers but construction is much better as well, NO plastic inner door, no plastic lint filter housing, no plastic blower housing, No cheap plastic blower wheel that comes loose from the motor shaft. And parts are much more readily available for WP machines,
And best of all you will never need an idler pulley spring, LOL.
John