From this MarketWatch article, things that affect the price:
@rodeo_flagellum It looks like the somewhat-bimodal distribution here is from people who are using the linked resolution source, which calculates the value to ~$1,100B, vs people who are using the myriad other sources that calculate it at ~$700-750B (for example https://comptroller.defense.gov/Portals/45/Do…). The bounds on the predictions seem more in line with the $750B values than the usaspending.gov numbers.