To start off, I must say I LOVE Buc-ee's! (Of course, I live in the county it was created in)
Buc-ee's must get insane discounts on buying their gas in bulk. The other night, Thursday or Friday I think, I paid $1.39 a gallon ($19.05 for 13.7 gallons) at their location in Ennis when the price everywhere else in the area is north of $1.75. A couple weeks ago their price was still as low as $1.29 a gallon.
Buc-ee's gas generally is cheaper than competing brands, at least what I've seen. In one recent case, a nearby Chevron was selling at $1.70 a gallon, but the adjacent Buc-ee's was selling at $1.61. I've heard that Buc-ee's treats gasoline as a loss leader, relying on their stores to make a profit.
I see they have a big wall of Beef Jerky. How many flavors could they possibly be to fill a wall?
Are their stores really the size of a supermarket?
Most of the Buc-ee's in Texas (and all outside of Texas) are super large and their stores are indeed as large as a supermarket, but there are small Buc-ee's scattered across Brazoria County (which are nonetheless as busy as the big ones; just look at the one on TX 332 near Surfside), sorta like how you can find small Love's in Oklahoma.
As for beef jerky, they have so many flavors, it's hard to keep count. They even have ghost pepper jerky.