I second the spraying with soapy water advice. Beneficial bugs are usually used in greenhouses where they can't escape.

Also, I don't know what sort of ladybirds they are offering, but if it's Asian ones, don't introduce them. It's too late already really but those are already an invasive species in Europe and we don't need any more of them around. Their larvae eat the European ladybird larvae and they are harmful for grape crops because of their stink. And they bite.