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The cost of replacement computers has plummeted of late but has reached a plateau of approximately $1200 for a capable benchtop machine.

Some schools have made good use of their older machines by having the server do all the work and the classroom computer acts as a "client" of the sever. A Pentium 100MHz machine can appear to be functioning as a Pentium 4 machine by having the server do all the work.

There are two software systems that allow the client computer to act as a fast benchtop machine:

Citrix Metaframe Cost $3850 + $250 Media kit +$250/user Will allow some multimedia and remote access. Citrix licenses are concurrent. Citrix will also allow remote access dial in in a very secure environment.
Windows Terminal Server Cost . $200/machine approx. Limited multimedia access (very limited video/sound)