Here's what I found during my last trip to Comiket (click for a larger picture). Prices are for individual items shipped, but if you want more than one, I'll adjust to take that into account. If you REALLY want something more than others, you can name a higher price and get priority.
The three Gita*Dora books are part of a set. Short 4-koma books with GF/DM characters.
Artist's Site. $12 for the set.
The one with Satou and Shishamo is a story about them with Hana and the girl from Go Easy.
Artist's Site SOLD 
Both of these are GF/DM character-centered doujins. Many different stories and art styles.
Artist's Site. $10 apiece.
Dream of Portable focuses on characters from Pop'n 13-15 and a few others. A smaller anthology, features many different artists.
Website SOLD
H-Tension 8 is a big anthology and features many different art styles and all kinds of Pop'n characters. No website. $15
Next Generation is a Tatsh & Yoshitaka CD/short story collection by Tribute Cafe.
Website, includes tracklisting and samples SOLD
The comic on the right focuses mostly on Kanako and the Ryuusei girls but also has Poet, MZD, Judy, and others. No website but there's a Pixiv ID if you really must have it. $10.
Post only what you want (and how much you're willing to pay optionally), and I'll PM you with a total.
FS: Bemani doujin comics and CDs 
