Hello Frier!
I've found a few quotes that match your preferences. If your parents have no pre-existing medical condition, there is a plan for $2598.80 with $0 in deductible. But if you go $250 in deductible, the premium will decrease down to $2338.92. These are the prices for both of your parents already.
There are more deductible options that you can find on this website:
https://arbetovinsurance.com/You'll also find there quotes from various companies so you can compare the premiums and coverage benefits that those companies offer.
Hope this information will help you!