Can anyone recommend a good inexpensive GST antibody?

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Shin Murakami

You could ask a sample antibody that they may provide from invotrogen (I think they are now under Fishersci) or other places such as (prices around $300):

https://www.scbt.com/p/gst-antibody-b-14

https://www.thermofisher.com/antibody/primary/target/gst

Sorry, it should be "Invitrogen".