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If You Cant afford this Then i will recommend you to get a fitness tracker which Gets Connect with any smart phone...
In fitness tracker You Can measure any thing releated to health...
But I am not sure that stress Checker is there or not...
Maybe this feature may avalible in Latest Fitness Tracker...
You Have to research on it..

Ahaha actually really I can't but thanks a lot for the alternative!

Yes It Costs 30$ to 40$ Of a average tracker ...
But If you go for high you may pay more money...

Xiomi Mi Is a Good Company
And also there fitness bands are Good