Used Cisco

2620/2621 Router - 1 network module slot platform with 1-2 10/100BaseT Ethernet port(s) and 2 integrated WIC slots. Primary difference between these and the 2610’s is the Fast Ethernet capability (Inter-VLAN routing!).
There are new 2600XM series routers available on the market, but these would not be a first pick for a home lab as they are quite a bit more expensive than the 2610 and 2620 models. The 2600’s are End of Life and the prices should be coming down.
If you are able to get a 2600 series router and want to load IOS 12.1 Enterprise, but you only have 8Mb of Flash, and cannot afford more flash, what do you do.
It depends. How much DRAM do you have? Typically, the DRAM is not as expensive as flash, so it is more feasible to add enough DRAM to run the image. Configure the router to boot from a TFTP server. That’s it, you just got away with a cheap cheat. The problem is that it is cheap and can become more of a headache than anything else.
This method is painfully slow and problematic. During the course of starting up the router at the beginning of a session or during a practice lab exercise when you need to reboot, you will hate every minute of it.
If you bought a router, buy the flash and DRAM required to run the 12.1 Enterprise Plus IOS, don’t “cheap out” now. Average prices for 2600 series 16Mb flash are around $50. Prices for 2500 series routers are even cheaper.
The 2620 series routers require 16Mb Flash and 48Mb DRAM in order to run the 12.1 Enterprise Plus IOS.
2500’s require 16Mb Flash and 16Mb DRAM.
1720’s and 1750’s can’t use Enterprise Plus, but they can use IP/FW/IDS PLUS IPSEC 3DES, which requires 8Mb Flash and 32Mb DRAM.
4000’s require 8Mb Flash and 32Mb DRAM for Enterprise Plus, but if you are using it as a frame switch, 12.1 IP IOS only needs 4Mb Flash and 16Mb DRAM.