From Longman Dictionary of Contemporary Englishat somebody’s disposalat somebody’s disposalAVAILABLEavailable for someone to use Tanner had a lot of cash at his disposal.somebody is at your (complete) disposal (=someone is ready to help you in any way) → disposal
Examples from the Corpus
somebody is at your (complete) disposal• My house is at your disposal.• Reality is at his disposal in the same way that ordinary language and the current literary conventions and devices are.• Everything you want is at your disposal. 