1500mg thc tincture for $60, will I find better?

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Looking for tinctures for the wife to use at work.
So far marys 1500mg for $60 is the best I've come across.
They also have one thats 1000mg thc / 250mg cbd for 70$ that I'm looking at.
Been checking a few moms but if anyone can add some input that would help.
Prices seem all over the place. For example, 400mg thc for 40$ at shamrock, why not get more than triple the amount for only $20 more? Unless sciencelab is waaay better than marys.
So you can see how this gets a little confusing.
cron