surjitca,
Cross over cables are about $3 - $5 on Ebay or just about any cable seller on the Internet.
If not, you CAN do VLANs and router-on-a-stick with the 2610s with the right IOS, in which case you can at least connect the routers to 2 of the switches. If you bought a CCNA lab that gave you switches AND 2610 routers, I would hope that you have the right IOS on them. I will have to look back over my notes and see if I can find where they added support for interVLAN routing on the 2610s.
Good luck!
E.A. Broda
CCNA, CCDA, CCAI, Network +