870p light attachment

[SamDBL]

I need a light attachment for my 870p. It doesn't have an extended mag, so I guess i'll have to put the light on the fore end. I saw an after market fore end with light attachment online for $200!! I know there's got to be something more reasonable that doesn't suck. Any experience? Also, I assume if the after market piece is made for an 870 it'll also work on the 807p? I see their fore ends are a little different?