All 3 Uses of

dispose
in
White Noise, by Don DeLillo

Jack Gladney would not do, he said, and asked me what other names I might have at my disposal.
Part 1

disposal = command

I had been generous with the power and madness at my disposal, allowing my subject to be associated with an infinitely lesser figure, a fellow who sat in La-Z-Boy chairs and shot out TVs.
Part 1 *

They spent two more days in the kiosk, the weak and faltering sister venturing out to scavenge food scraps from the cartoon-character disposal baskets with swinging doors.†
Part 1

Definitions:

(1) (dispose as in: dispose of the waste)
to throw away
(2) (dispose as in: dispose of the matter)
to settle something so it no longer requires attention
(3) (dispose as in: dispose of the assets)
sell or transfer to another
(4) (dispose as in: disposed the troops along...)
the arrangement, positioning, or use of things
This sense of dispose can be used in the form disposal to indicate that a person can use something as they wish -- as in:
- I am at your disposal.
- She has many assets at her disposal.
(5) (dispose as in: Is she disposed to help?)
inclined (with a tendency to; or in the mood to)

This is usually seen in the form "disposed to..." or "disposed toward..."
(6) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Less commonly, disposing of can imply killing someone.