In case anyone else is interested, Thryve is doing a promotion for one month free (essentially one free microbiome test). Just use the code healthygut at check-out. The price should drop to $0.
Note: I am unsure if this is only for new users or not, since this will be my first test through them.
And Word of Warning: Even though it is free, you will need a credit card; and your subscription will auto-renew each month at full price if you don't cancel it before then!