Besides the obvious of going to a interior decorator like Gracie Homes (local) you can order them online. I used Window Connections (now Blinds Direct) which will get a local contractor to come in, do measurements and install the blinds for free. You can also order swatches from them.

TIP: Remember to remind them (again and again) that the ceilings are concrete so they will need to bring BIG DRILLS and heavy duty drill bits.

You can also use Home Depot Expo as well as Blinds To Go on Queens Blvd.