I've used Yahoo finance and it served it's purpose for delayed option chains, but seems to not work effectively lately. Hasn't updated in days now. I have live updates on my trading app, but it only allows me to view one specific option at a time (ie, requires me to be specific as to date and strike price.
Which quotes are you looking at? Yahoo Finance has the best option chains. You will not find anything better.
I know, but it's not updating for me anymore. I guess it's still working for everyone else, maybe my computer is the problem - have too many programs running possibly. Will try restarting computer.
Options Industry Council website is another source. 20min delayed quotes. https://www.optionseducation.org/toolsoptionquotes/optionsquotes