cant recommend a cheap scan tool through owning one as all my scanners cost between $6-7000 each (except for tuning tool) .. here is one i found on ebay and says it can do VT-VZ along with VE
Handhold OBD2/EOBD Auto SCANNER GS400 | eBay
just need to be careful though as although they say they can do a protocol GM uses there own PIDS in the ECU and some of the cheaper scanners may not pickup on them