If you get anywhere in the Ball Park of around $330.00 to $350.00... these will all be good options...but please consider that while not an absolutely necessary sub-component for the "GYMKO" Tech 2 Operation... THIS Deal includes the OEM
Black Plastic Carry Case that is a very rare addition to this purchase and one that I have found to very much appreciate when moving all my gear from one location to another. Also... My variant of this Kit is a DBOM (Dead Balls On Match) to this offer and as such... it was the Bosch European Version called "Vetronix" and the Bosch OEM TIS2000 Dual Discs for the Laptop SW Installation were included... along with everything else required. Others here who have Pulled The Pin and made this purchase may chime in with their own experiences and may suggest other sources.
If you insist upon "shopping around" ...visit aliexpress.com next... and use the Search Expressions of:
Tech 2 G-M Vetronix, Bosch USB Dongle, etc. and be very careful to read the fine print to ensure that what you are getting as touted to be "A Complete Kit"... actually has ALL of The Bells and Whistles that THIS particular Kit possesses. Please bear in mind that unfortunately... we have become embroiled in a Tariff War ... that has affected USA-Canada-China-Mexico relationships and resulted in higher S&H Costs. As always...it is the End Consumer who suffers from these events.
Nonetheless... Were I you... as a confessed and very satisfied Owner and User of this "GYMKO" Tech 2 Kit... I would
NOT let these issues dissuade or distract me from laying my hands on this Amazing Gear ASAP. This "GYMKO" Hardware will lift a HUGE Repair Diagnosis Problem sitting on you like a Stone... right off of your chest... and let you tell the "Stealerships" to
Go Pound Sand! So far... The Members ...
and probably quite a few 'Lurkers' who visit here and are Welcome at GMTN... have all been equally satisfied after getting their Own "GYMKO" Tech 2 Kits.
Please read well back in the above prior thread postings about the need to also either obtain a Digital Crack from
@Mooseman's sources... or spend the additional $10-$15 required to purchase a USB
"HWK" (Hard Ware Key) aka 'Dongle'... which allows your required Windows XP Pro SPS3 Laptop to communicate between the Tech 2 and your 2008 Trailblazer for Pass-Thu activities. I have tried to cover this subject matter almost down to an Atomic Level of Detail in this Thread... But... for the sake of your Sanity and Brevity...I would urge you to read and follow all of the Posts made by
The Master on this Tech 2 Topic:
@Mooseman ...as well.
For
@TollKeeper ... The access needed to either install, update or change out Modules requiring the inclusion of programming in your Particular VIN for these components... should also include the Radio... and is exactly what the "GYMKO" Tech 2 Scanning Tool is designed to analyze and address. There should already by some sub-topics on the issues about the Radio Problems on the GM Class 2 Databus somewhere here in the Tech 2 Forum.
@Mooseman can probably give you the best place to look for that information.