Ok friends, I need your help...

I have just learned that Nathan's mother is coming to visit in about 10 days. That's really great. No, really. It's just that I've been ignoring the guest bedroom since we moved in. I didn't expect anybody to come visit any time soon. Now I'm in desperate need of a duvet cover. I really want to do something sunny and yellow in there, because I love yellow for decorating and Nathan doesn't. If I can stash it away in the guest room, it's a perfect compromise. Nathan doesn't have to live around the yellow, but I still get to use it. I really love this duvet cover from Pottery Barn, but I don't have $150 for one.

I also really love this one, even though it's not really yellow at all. But also massively expensive.

The style I'm going for is floral, but still within my own generation. That's the nicest way I can think of to say "not old-womanish" without actually saying it. Oops. But anyway, I love this one because it's a beautiful robin's egg blue, not that dusty blue from the 80s. I can't really explain why I love it, so maybe we should just stick with yellow.

So far, I've been to Target, Pier 1, and Bed, Bath, & Beyond in person, as well as websites for Target, BB&B, Crate and Barrel, CB2, Macy's, JC Penny, Anthropologie, Amazon, The Company Store, Overstock.com, Ikea, QVC and Home Shopping Network (so I'm getting desperate, ok?). No luck with anything affordable in yellow.

Do you have any other suggestions for websites with nice, at-least-somewhat-modernish bedding? ANYTHING at all?