@joshlete How much do you want to spend? I'm not the best with kg, but in lbs its generally:
2x 1.25lb (optional depending on linear program)
2x 2.5lb
2x 5lb
2x 10lb
2x 15lb
2x 25lb
2x 35lb
2x 45lb
2x 55lb (optional depending on strength level)
You can get a cheap set of iron weights...