I've gone into local CompUSA (and I did buy the monitor there), and told them the needed adapter didn't come in the box (which the package slip clearly stated would be included). They had several (from Viewsonic) that were intended for my monitor.
Its worth asking. Simply say you bought a monitor that didn't have the adapter and if they had any available. These items are available for about $30 and its a crime they cost so much. The manufacturers put their own ones out and give them away with the monitors (look for a model that has compatiblity for both mac/pc).
In any case, they may be willing to hand over one for you. I've had a guy offer me a PS2 to USB converter (which I was looking for) if I would sign up for internet access with MSN! He said I could then cancel it for no charge. Basically they were giving him kickbacks to sign up customers. I wanted to *buy* one of those adapters that come with some USB mice and they evidently don't sell them, but had several from their 'display models' in the back.
[ 04-09-2002: Message edited by: bluedog ]