To simulate frame relay in a Cisco lab, the easiest way (and typically cheapest) is to buy a good old 2500 series serial router; these devices offer 2 or 8 serial connections (DB60) that can be used to connect to Frame Relay end devices (more modern routers).
The two Ethernet models that exist in decent supply on e Bay are the 2520 (2 port) and the 2522 (8 port).
This article explains how to achieve practical time synchronization on Cisco IOS.
This is the beta-quality development branch that will become IOS 12.5.
Jun 8 2010: IOS 12.5 was released as IOS 15 in Nov 2009.
Unfortunately, many of the people who sell used Cisco equipment are also looking more to make money from the venture and not help those attempting to increase their knowledge.
This leaves an opportunity for those companies with the required talent (preferably Cisco certified people on staff) to offer equipment that is reasonable and fulfills the requirements of the current and future certifications.
Cisco used to provide a free TFTP server that you could download to load the image via the server, but Cisco has discontinued this because there are many inexpensive or free alternatives. ) choices to use as your TFTP server: enable Password: Router1#copy tftp: flash: Address or name of remote host ? You can also use this image for troubleshooting or diagnostics.