Where to buy cheap curtains for a wide but shallow window

[MirrorMirrorOnTheFloor]

I've got a window which is 200cm wide with a drop of 106cm. But all the standard curtain sizes seem to assume that a window this wide is much deeper. Is there anywhere I can buy off the peg, or am I going to have to get them made at great expense (or possibly just live with them being much too long...). The nearest I've seen is 90" x 54", which isn't that close...

90" width is fine for the window width. I'd get the 54" drop and have them taken up at a local dry cleaners. I've done this a few times and had good results.