theprimehost
Managed VPS Gurus
This might be a niche market, but it's just like any other in this regard. Buy low when there's not a lot of demand then sell high when there is.
I suppose you could say that this statement is the core essence of any business, however some products just move faster at "special rates" than otherwise as clients feel like they're getting more for their money. A greater value, if you will.