I have been debating that question as well. I was thinking of starting at $100 for the 4 foot one (which would be $30 profit). I do not think the mark up is enough but I also want to price them where they sell. I have talked with some parents who have kids playing sports and most knew of the products for the Professional sports and most acted like $100 was about what they would pay. Therefore I thought start with the smaller one and make it $100, so I would have one priced at $100. Then I thought I might go up $10-$15 for each additional foot if they want bigger. To get more mark up I also have thought of making the 3 foot one $100 ($40 profit) and then go up from there.My concern about the bigger one is the resolution. Normal rule is you need 100 DPI resolution. If this is true for the Wall Clings as well, you will need a lot of mega pixels to do the 72X48. For my 10 MP to print this size it drops the resolution to 53 dpi. Has anyone heard what the minimum resolution is for these?