Gravitation is currently available on VHS. There are 4 VHS tapes containing all 13 episodes of the series. The language is original Japanese with English subtitles.

Series Volume 1: episodes 01-02
Series Volume 2: episodes 03-05
Series Volume 3: episodes 06-09
Series Volume 4: episodes 10-13

Gravitation is also currently available on DVD. There are 4 DVD Discs containing all 13 episodes of the series. The language is original Japanese with English subtitles.

Series Volume 1: episodes 01-02
Series Volume 2: episodes 03-05
Series Volume 3: episodes 06-09
Series Volume 4: episodes 10-13

There are a total of 2 Gravitation OAVs, and they are available in VHS and DVD format. There are 2 VHS tapes and 1 DVD for the 2 OAVs. The language is original Japanese with English subtitles.

There are currently a total of 2 Soundtracks, 2 vocal collections, 3 Sound Stories and 2 audio CDs. They're all listed below.

Gravitation TV - Track OST

1. Super Drive - Silent Beat Mix
2. Super Drive
3. Super Drive - Pure Silence Mix
4. Super Drive - Zero Basement Mix
5. The First Dimension
6. Glaring Dream - Secret Dream Air Mix
7. Glaring Dream - A Light In The Black Mix
8. Glaring Dream
9. Missing Piece
10. Melting Noise
11. Liquid Brain
12. Power Cave
13. Sleepless Beauty - Sacred Beauty Air Mix
14. Hypnotic Distortion
15. Sleepless Beauty - K.Ito + DK
16. Sleepless Beauty - Snake Bite Mix
17. The Rage Beat - Zoom Mix
18. The Rage Beat
19. The Rage Beat - The Last Element Mix

There are presently 2 Audio CDs, each retelling the manga featuring voices of the anime Gravi cast.

The Gravitation manga is currently 12 volumes long, with each volume containing about 5 tracks and totaling 206 pages. Presently Maki Murakami has discontinued the manga indefinitely.

There are currently 3 artbooks, the TV Animation Artbook, the Gravitation Complete Fanbook, and the Gravitation Complete Fanbook 2. The TV Animation artbook is the only artbook that contains anime images. Each artbook contains about 85-87 pages.

There are currently 11 (there are 12 images because there's a volume 8.5) Remixes/Doujinshi created by Crocodile-Ave, co-dependent of the original creator: Maki Murakami. Ms. Murakami is the current artist of the remixes. These contain extremely graphic scenarios, including boy x boy (multiple pairings, some not seen in series), graphic incest, and group sexuality. The remixes are specifically targetted at a NC-17+ audience.

MANGA STORES

Buy.com
- Go to Buy.com for the cheapest licensed (English) manga. Right now you can only pre-order up to Volume 5. The manga's currently being licensed by TokyoPop.

Kinokuniya
- This is a store carrying manga, books, magazines and such. If you can find one near your residence, I suggest going there instead of ordering online. ^^

Planet Anime
- Also a store, with a rather large collection of merchandise, manga, books, music, etc.

Japan Manga
- This place has some of the rarest selections in stock. O_O You can also find doujinshi, CDs, VHS, and merchandise here. But there are quite a few hentai manga too...

JPQueen
- I love this place. It's got the cheapest of of the cheap manga, artbooks, doujinshi and CDs for a decent quality, AND they have all the rare stuff, all imported from Japan. What's not to like? XD

Aestheticism Cybershoppe
- Lots of manga, doujinshi, magazines, and such. They have a pretty large selection and at relatively reasonably prices too.

BOOK STORES

Sasuga Books
- Very good selection of artbooks, magazines, DVDs, videos and more. You can also find manga here, great service too. :) Everything's imported directly from Japan, and you can place special orders.

DVDs/CDs/VHS/OAVs STORES

CD Japan
Very nice place with a ton of different CDs, VHS, and DVDs of all different kinds of anime, J-pop, J-rock, movies, and more.

ChibiTokyo
Most of the Gravitation CDs can be found here, for an ok price. No sound stories or anything else though. Still, I'd go just for the soundtracks.

AnimeToxic
Again, most of the CDs can be found here, including the sound stories, for a pretty cheap price. They also have DVDs.

Animaxis
The only store I know of that sells the Gravitation OAVs. It's not cheap -.- but if you're desperately looking for OAVs, this site has them in DVD format.

MERCHANDISE STORES

Planet Anime
- A nice store with a large collection of merchandise, manga, books, etc.

U.S. Anime
- Great variety of merchandise, phone cards, clearfiles, doujinshi, etc.

Also check out EBay.com for auctioned merchandise.