The price depends on the manufacturer, size, functionality, material and workmanship. As different as the various models are with their individual advantages, their prices also vary greatly.
Inexpensive models are usually discount products without many extras. They are usually smaller mobile rotary dryers. These are available for as little as 20 euros. If it is a high-quality and durable premium product with a large span and a high line capacity, you can expect a price of around 200 euros.