I am looking for vertical blinds for some rental property to go over the sliding patio door. I have had the inexpensive white vertical blinds, but they often break and don't add a lot to the decor of the room.

Went to Menards, HD, and Lowes, but all the products that they offered seemed to be in the light side (not durable). (Bali, Levolor ...)

Had a designer come over and take some measurements, but they came back with an estimate of $600+ !

Where can I find blinds like what the hotels install or the commercial buildings use ? Something that is is more durable, but south of $600 !

Any help is appreciated.
Thanks