Where to buy or sell business online

[temi]

I wonder if there is a good website for buying or selling online business. An individual approached me about selling his business but I don't know how to go about this, any one with experience of buying or selling business online?

[thud]

Purely an online busines? I assume youve considered Sitepoint and DP. If its a UK business I know of another place and can find the link if you want (only if its a tangible business)