Last night I scoured the web for alternatives, looking at every site I could possibly think of. I also plan to poke around the Garment District looking for replacements when I get a chance, but I really need to focus on muslin-ing instead of fabric shopping.
I found plenty of "close but no good" options--lovely little B&W polka dots in wovens (no way--I really want a stretchy knit top for this pregnant belly of mine), or perfect brown & white polka dots, or B&W polka dot jerseys with no lycra content (not stretchy enough). I even considered going for narrow stripes instead, but decided I was not yet that desperate. I did have to give up on no polyester--it just wasn't do-able.
Here are the current contenders!
Gray and black polka dot slinky from Gorgeous Fabrics:
B&W ITY dot jersey from Denver Fabrics:
Scrollwork ITY B&W jersey from Gorgeous Fabrics:
The latter two probably fight too much with the purple print skirt, so the current front-runner is the slinky, not that I've ever SEWN with slinky, but I'm sure my brave little serger can handle it (once she stops unthreading her upper looper every five minutes, grr!)
Just to comfort myself today, I'm wearing this B&W lycra-blend jersey polka dot dress (though it looks a bit different over my preggo belly, it stretches to fit just fine):
UPDATE! I think I found it! With some help from a thread on PatternReview I decided to check the Spandex House website and they had this ITY jersey print listed, just $6/yard! I called and it's in stock, so I'm going to go check it out on foot tomorrow. I am so excited! I think I'll get 5 yards--2 for the top, and 3 for a future dress project...