The workhorses of the Federal Army are the Racoon ARV and Grizzly Heavy Transport. Both vehicles have had many variants with field modifications adding to the variety of models availiable.
The larger vehicle has been converted from an old Dinky Stalwart that had been sitting in the garage - in fact, I think I've had this since I was in primary school - and the smaller vehicles are modified Matchbox Armoured Responce Vehicles. So all in all this set of vehicles has cost less than £10. The figures are ARC Recon from Critical Mass Games.