If some guys wanted some made, I'd do it. Wouldn't be anything elaborate though, no mirror lettering or anything like that. I could do GXP or GT or somthing similar in the correct font ("GRAND PRIX" would probably cost more). The trunk liner matches what we already have in the trunk. Yes it's made of foam board, and weighs next to nothing. I'm going to put this one in my car tomorrow night and I'll take pics.
Material wise, all I have in it is the foam board ($17), might be able to get 24x36 pieces (4) at a combined cheaper price, the trunkliner material ($10), push pins are $2.50 (6), a can of spray adhesive ($12) would last for 3 mats. If you wanted it like the above, I could put the trunkliner material on and send you the bare back piece and you could adhere whatever material you want to it. I'm just using masking tape to hold it up against the lettering.
Time wise, it took me about 4 hours to make the above, cutting out the letters is the ***** part of it... I haven't tried a raised lettering yet, but someone asked about doing one so I may attempt that. So with that all said, what do you think is a fair price?