It sounds like you have good ideas but I haven't seen any
DiSC Profiles/Tests where people can buy them, take the profile instantaneously and get their results when finished. There are systems that work with two of the three factors but I haven't seen all three. In order to sell them you have to become a distributor. This typically means hooking up with another distributor to sponsor you. The results are provided as a PDF that you could attach to a profile, email to someone or save to your hard drive. They don't expire.
Inscape Publishing has a system where you can deliver the profile access codes online and people can see their results instantly but you still have to send the initial access code. However, they have another option where people can purchase online administrative accounts so people can distribute their own access codes. They offer quite a few variations of the DiSC Profile but they also offer others on teams, diversity, listening, learning, work expectations etc. They also have sales and management specific versions of the DiSC profile.
I hate to make a sales pitch but we've been a distributor for almost 10 years and I'm very impressed with the resources Inscape provides (marketing, research and product development). With that being said, the competition is heavy. You do need to go through another distributor in order to sell them. If you're interested just send me an email and I can talk to you more about it
dbowlby@corexcel.com. Even if you didn't partner with us I am happy to describe the process. or at least what I know about the process.