But I think there are plenty of places you can get what your looking for. But it really depends on how much bandwidth you need, additional services, more detailed hardware requirements, etc. I don't think many people can just come out and say they know where to get a xenon server for 300 or less on the west coast without knowing additional requirements. :/
Also, just so ya know, if your interested in a webhost that doesnt have a xenon plan listed on there site, you might just try giving them an e-mail. The majority of hosts will create a custom solution for you.