Need help shopping for window cleaning supplies

I got offered to clean the windows of one of my commercial accounts. I read a lot of post on TMF and watched many videos on the trade.

I need help on what I can buy at the supply center I am about to go to today? They will be of no help to and will probably make me buy more than what I need because that's what they do.

I know I need a window brush, long squeegee, short squeegee, poles, towels. I just want to buy good stuff not Home Depot cheap crap. Here are photos of the job I have to do....

Need help shopping for window cleaning supplies