My wife just took a job at a place that has a 'good' health insurance plan.
If she opted into it, her contribution would be ~$300/month, her employer's contribution would be $900/month.
If she wanted to cover me with it, her contribution would be $1,500/month, and her employer's would be $900/month.
Unsurprisingly, we did not take advantage of this, and she remains on my insurance (Since my employer handles 90% of the premium for both of us.)
When we were still dating, I had a good look at what the $300/month health plans provided. Absolutely flippin nothing. Deductibles of $8,000/year, and co-pays of 25%. If all you can afford is a $300/month plan, there's no way in hell you can afford an $8,000/year + 25% medical bill.
Meanwhile, Canada provides universal healthcare for $5,200 USD/year/person, with similar health outcomes.
Edit: fixed a typo in the employer's contribution.