I would like to get a sample of budet items for construction,
development, deployment and operating a website that could would
handle millions of transactions.

Dedicated server. For millions of transactions you'll probably need a
super server. Serverbeach.com or rackspace.com has great dedicated
servers but you may need a co-location type of service.
http://theplanet.com/ is also a major contender. cogent.com offers
bandwidth.

Then, get a perl or php programmer to handle the coding. Call the
credit card companies to see how to enable number validation. I would
also hire some linux experts to probe your site for security.

So, $200 server.
$x programmers

if huge
$1000/m bandwidth.
$x server
$x colocation installation.