Phonetics On and On Promo Poster by Horsegirl typically asks about $47 on Music Merch Marketplace (M³), based on live listings from eBay, Discogs, and official stores. That is 58% above the typical poster on M³ at $30. Condition, size, and signatures can move a single copy's value.
Music Merch Marketplace (M³) doesn't have enough live listings over time yet to say whether Phonetics On and On Promo Poster is going up or down in price.