We treat driver bits as CONSUMABLES: we have some on hand, of all types :phillips, flat, torx, security, square, etc.
We do rent complete sets, but maybe you only need one or two ?
They're available when you rent the appropriate tool, on a no-extra-cost, first-come, first-served, as-is basis.
And we are always happy to take donations of these, if they're new or lightly used.