Well, what is considered 'reasonably' priced?
Nunatak makes the Teanaway Down slippers, your choice of shell material, avg. weight of 3.5 oz., though they range around $100. They have a few other burlier models.
Sierra Designs Down Bootie, weight 8 oz., nylon, cordlock, prices range, 650 fill down. *Zappos.com has them in black or vine in size medium for $49.50
Sierra Designs Down packable bootie, 7oz., $45, same as above more or less minus the reinforced ankle and cordlock.
The latter two choices are the most affordable and offer some decent features for the price, tho they're considerably heavier than the Nunatak or Western Mountaineering offerings.