I never got a chance to pick up a lightgun for my Dreamcast so I'm wondering if there is some type of adapter that I can get to use either my PS2 or X-Box guns with it? or does anyone know of anyplace that still sells the Dreamcast guns online?

got to go with ebay

im such an ass a while ago i traded in my dc all my accessories including a good light gun and confidential mission and numerous other games for some crappy in store credit i should have traded of sold them here. now i regret it. but yeah you need a dream cast light gun ones for other systems are not compatible try ebay or maybe try a video game store like game stop or eb games they have used stuff.