The last time I went grocery shopping, I bought an extra three or four pounds of ground beef because it was on sale. I used part of it for hamburgers, and while I was making them, I just kept on making them. I eventually used up all the ground meat into little quarter-or-so pound patties. I used to do this all the time but had gotten out of the habit. It's a good habit to be in.
When I form all the ground beef into patties, I can use them for burgers -- I just have to thaw them, season them, and throw them on the grill. Or I can just pull four patties out of the freezer and thaw them for a pound of beef to use in meatloaf or meatballs or tacos, etc. The meat thaws much quicker in patty form, so if I forget to take it out early in the day, it takes only an hour or so to have thawed meat.
Take a pound of ground meat (or if you have a two- or three-pound package first divide into two or three parts) and divide into approximate quarters. Form each quarter into a patty and place waxed paper or parchment in between. Place four in a quart size freezer ziploc bag or eight in a gallon size freezer ziploc bag and freeze.