A friend of mine got free worm count kits from Westgate Labs, and we used them on our horses. There was a small fee for the processing of the poo but they emailed the results through, and sent a letter confirming the result with extra information. As far as I know you can get more than one kit free but not sure.
Abbey Diagnostics are brilliant. Just email or phone them, they will send you the kit, you fill and send back, then they will send the result quickly by whatever method you choose.