This is a good colocation service (they provide hardware):
http://www.johncompanies.com/collocation/
Here's one that's really cheap and offers php/mySQL (no asp...but oh well):
http://www.ipowerweb.com/
and if you're going to run it off a server at your house, get linux/unix/bsd/something similar with apache + mySQL + an asp mod (there are 3...one is commercial...one is perl based...and the other is a gnu project methinks...).
if you need more help or something, you can contact me with what you're looking for (space req., supported server side scripting, database, etc etc) and i'll see if i can look around and find you something cheap (or i might be able to work something out on my connection)...
*jeremy