I personally have not used a footprint for years and consider them both unneeded weight and an unnecessary sales gimmick. However, if you really want one, lighter (and cheaper) alternatives include, in order from the least to most durable and also from lightest to heaviest: (1) a piece of painter's drop cloth cut to fit, which lasts several trips; (2) a piece of polycro plastic (from storm window kits at the hardware; also available, more expensively, from Gossamer Gear and Mountain Laurel Designs), which will last a season or two; (3) a piece of Tyvek. When cutting to fit, cut the edge of your footprint to be an inch or two inside the edge of the tent floor on each side. Otherwise it will catch water that runs down the side of the tent and funnel it underneath.

If you are absolutely determined to spend the money and carry the weight of a manufacturer's footprint, probably the only ones who can answer your question are the customer service folks at Big Agnes.