Yep, that's me! Currently I only have GP 3700s and GP 2300's (AA) available via my store, but I hope to have the 3800s very soon. I am also in the process of making some Gas Reciever packs which should be released next week. I can also make up any configuration of GP 3700s you need. If anyone wants to speak to me about custom packs etc. my e-mail address is sales@boomboombatteries.com