I don't know of any Failover systems for cheap,
Especially 100% uptime.
The Salesman probably talked about Microsoft Clustering Service.
But as you probably know that's with Duplicate Servers/OS etc.
A Good Server with Redundant PowerSupplies and Raid Drives should give your reliablity.
What type of business do you have that requires the 24hr access?
A salesman recently introduced us with this technology called Brightstor High Availability Manager. According to him, it can provide fast server and application failover. It uses 2 servers; the data stored on the primary server is replicated in real time to a secondary server at a very high speed. It will automatically detect critical problems with the primary server and immediately switches activity to the secondary server, so that users can continue work with virtually no interruption.
We were initially quite interested of it, but we found that the price too steep. We would like to find out if there are other similar solutions besides the above mentioned. Currently we do tape backup daily and are very curious and interested of the idea of allowing the users to continue work with virtually no interruption. Care to recommend?