finding heavy duty vertical blinds

[Ralph D.]

I want to replace a broken set of vertical blinds with something with a heavy duty track and hardware. Has  anyone had good experience with buying something like this online or is there a brand and model available through a box store that uses a heavy duty track and hardware? I've found a few potential sources, but they are set-up for bulk orders or require setting up an account. 

I've noticed higher quality in a specialty stores, but their prices are too high since they insist on a custom measuring and install which is not a complicated task for blinds that are mounted over the window opening. Thanks for any suggestions. I am in Knoxville, TN.

Ralph