I don't know how formal your space is, but IKEA has curtains that come in, I think, 110" lengths. They can easily be trimmed and hemmed. We used "TALL" curtains in our house. They are a linen-ish fabric with wide vertical stripes. Semi-sheer. It works perfectly in our contemporary space.

JCP is a favorite at my house. And they often (as in now) have free shipping!

If you have a Tuesday Morning near you, they have 96" long. Running 49.00 a pair.

I second the Ikea suggestion. I got wonderful white semi-sheer panels for $12.99 per pair, 110" long.

Overstock, "the big O," has loads of 96" and longer curtain panels, and some seem to be of decent quality at good prices. But if you are near an Ikea, it is an outstanding source for long window coverings at very low cost. When we moved into our house in 2003, I bought 4 55"x110" navy & cream striped canvas panels ($25.00 for all 4) to cover the 110" window in the the living room. Put up some nice white wooden brackets with an ornamental white wooden pole and hung the panels on white wooden rings purely as a temporary measure, I assumed. But I have since bought 3 different sets of drapes for that window and sent them all back because none of them looked better than the simple cotton panels from Ikea. I finally gave in and lined them.

Target also has 95" curtains. My daughter bought some faux silk ones for about $25 per panel.

Another vote for Tuesday Morning. They have 96" lined and interlined, $50 a pair for some very nice faux silk and some tone on tone cotton stripe ones too.