This is a serious question to anyone reading this. Where can I get an inexpensive .50? They sure have everyone's panties in a bunch.
It depends on what you consider inexpensive.
There are lots of makers of .50 caliber BMGs:
Daisy, Barrett, McMillan, Robar, SR-50 (Stoner), American Arms, Armalite, Advanced Weapons Technologies, Iver Johnson, Harris, and EDM, to name a few.
The prices range from around $2000. to over $7000., depending on single shot or semi-auto, and depending on brand and model.
If you want a top end model with top end glass expect to invest around $8000.
Ammo will cost around $1.80 a round off the Web bought in bulk quantities.