I know that for promotional items through places like Gamestop and such, promotional items are just that: Promotional. Items that aren't meant to have high retail sales value (well, y'know, aside from the occasional hat or t-shirt).
Huge promotional packs like that of Portrait of Ruin are extremely rare and are more often than not included now in Special Edition packages, if producers deem it worthy to release said editions. (note how the soundtracks to GTAIV, DMC4, and MGS4 are all included in their special edition packages).