Does anyone have a ballpark figure for how much Flash Streaming Server 2 costs? Also, are there any free alternatives out there which would work for a relatively low use system?
You can still download the old one via the support centre http://www.adobe.com/support/flashmediaserver/downloads_updaters.html - the updates are actually full versions and I'm pretty sure you can use the dev version for non-commercial purposes although you are limited to 10 streams.
Another option is to rent bandwidth on an FMS3 hosting service (Google is your friend).
There are a number of free Flash Server replacements that may do what you need. Alternatively use the Flash Server in demo mode, which gets you 10 simultaneous streams for free.