I think these pillow covers are so unique. AND... I found someone who actually made some that look similar to Pottery Barn's. If you are ambitious and can sew (no hope here) FABULOUSLY CHIC made four of these pillows for $14.37. How can you beat that?
Horchow French Laundry Vintage Number 7 Pillow = $150. (ONE PILLOW)
Pottery Barn Number Pillow Covers = $99. (set of four)
Fabulously Classic Look-a-Like Number Pillows (How To) = $14.37 (all four)