Ikea -- good quality -- good price and you get TWO panels for the price (unlike a lot of drapes where you just get one!) Highly recommend.

Aina -- http://www.ikea.com/us/en/catalog/products/10284201/

But they are only 98 inches long.

although the linen choices are more limited and probably not the provenance/quality of RH, Village Workroom (aka VillageDrapes.com) does very good work. I've used them many times. Joe will send you samples of their swatches within about a week. Leadtime is about two weeks. (They may be willing to source other fabrics)

There are a couple of other online workrooms that people have used, but I have not used them -- see those threads. (I did source some nice linen samples from DreamDrapes but have not ordered from them).

The Shade Store has a good selection of linen. They also have Brick and Mortar boutiques now where you can see samples and get consultations. They tend to be pricier.

Calico Corners is also an option, with a good variety of higher quality linen.

Country Curtains will do custom panels for their soft linen line. They offer many colors in addition to basic white and natural. Great customer service, good prices, been in business forever. BTW, they expanded beyond "country" a long time ago so worth a look.