drivie,
i have the mini rail + foregrip from AAC. got it from them this past oct. their website has it as $99, but the SGN ad i quoted had it for the $45 "special package deal." your best bet is to call them and tell them you saw it in the SGN ad (i think they are still running it); they are slow to answer their e.mail (not to mention the holidays).
overall, i am satisfied with the unit. it didn't come with instructions (as it was supposed to), but it wasn't very complicated– just kind of a minor PITA to install if you have the M4-style double heatshields.
for the money, it's hard to beat– considering just a foregrip will set you back 50-60 bones and basically any rail system starts @ $200 and up. i just wouldn't mount a laser or any kind of optic sight [on the AAC unit]; when mounted, there is still some movement (as the handguard itself moves). i guess a light would be okay. hope this helps.