I just got curtains for our new picture window. It's 118 inches wide. I didn't want to spend a fortune because we are going to redecorate the room in about two years. The cheapest custom drapes for the window would have been about $750, not including hardware, and that was more than I wanted to spend given the circumstances. Getting wide enough off the shelf drapes is the problem, and I also wanted them to be washable.
I got a 120 inch double rod from JCPenney. I also bought four 52"x84" Robert Eclipse back tab panels. I was able to sew two panels together to make a pair of 104" wide curtains. They came out nicely and hang well, despite my sewing job.

On the back rod, I hung two sheer Lisette 118" x 84" panels, also from JCP.
The total cost was reasonable--they have good sales on drapes. I used a 15% off coupon that you get from them if you do a survey to take the price down further.
If you don't care about machine washability, their Supreme pinch pleat drapes come in wide widths. I thought about doing this instead of sewing two sets together, but what I did was less expensive, saves the cost of cleaning, and since I might replace the whole thing in a few years, made more sense.
I'm very happy with how it turned out, but don't have pictures for you, sorry.