What is the proper volume to weight conversion for Bisquick? Most recipes that call for Bisquick have volume measurements, but I've read it's better to measure most dry ingredients by mass (not to mention more convenient and less messy). So what is the proper conversion factor for Bisquick (i.e. it's density)?

I assume it's close to that of flour, but different types of flours have different densities and I wasn't sure which one to use or which one the Bisquick manufacturers assume when developing their recipes.
Do you have a scale and measuring cup? Weigh a cup of Bisquick.

Also, this site has a line for Bisquick, but I'm not sure how trustworthy it is, being from a "forgotten source". Anyway, the site says Bisquick is 130g/cup, and also lists the conversion in a number of other units.