Do any companies offer 'ejection' experiences?
No, there are no companies offering ejection seat experiences, for many reasons:


Cost: Ejection seats are expensive, base costs are somewhere around $100,000 per seat. Seats can't generally be re-used, therefore the cost of an experience is going to be well over that
No platform: There are airplanes that are designed to eject someone and keep flying safely, they are used exclusively for seat testing and not open to the public. Someone would have to develop and build an airplane designed to give a "fighter plane ejection" experience
Ejection is incredibly dangerous: the chances of injury or death are very high. Ejection seat companies have used test dummies instead of humans for decades for this reason 
Ejection can lead to life changing health issues: the G forces on a modern seat are at least 12G, and go up from there - they can't be any less or you won't clear the airplane. This compresses the spine and can lead to debilitating, life lasting injury. If your ejection position isn't right you can break or lose a limb
Ejection isn't fun: there's not a pilot or crew member in existence who has used an ejection seat and said "Whoopee! Let's do that again!" Instead they say, if they are capable of speech, "Ow!" or "Please get me clean underwear."


So a company would have to spend tens of millions to develop a system that only rich people would be able to use, still less would want to, and a very precious few would be crazy enough to try.