Great post Telly and a great idea to purchase access to info on different supplemental companies and their plan rates. Of course in my opinion after corresponding with a few insurance brokers and reading many threads on a senior insurance forum linked further down in this post, most would likely disagree with this.
I have a background in health insurance and started my career processing Medicare claims, so for me I had a huge advantage over most people when it came time to learn/get back up to speed on Medicare and all the supplemental plan options and the companies that offer the plans. For me I found watching YouTube videos about Medicare much less boring than reading about it.
I live in FL and in my research I found FL supplemental rates are posted online yearly by the FL Insurance Dept, which helped me tremendously when looking at the plan rates for all the different supplemental plans before I even corresponded with an insurance broker.
https://apps.fldfs.com/mcws/CWSSearch.aspx
When researching about different companies that offer Medigap plans, I also found another website which helped me tremendously. Info such as what companies close their Medigap plan subsidiary in order to open up under a different subsidiary to keep initial rates low, how often some companies raise their rates and what brokers think about these companies, etc. No broker works with all insurance companies and some only work with the ones that offer them the greatest commission.
https://insurance-forums.com/community/forums/senior-insurance-forum.27/
Medicare Advantage was out for me from the beginning. We travel too much to have a MA plan, plus once you become ill, your out of pocket cost will likely be higher than having original Medicare with a supplemental plan.
South Fl has some of the highest supplemental insurance rates in the country and in the end I went with Plan F HD, which most brokers will not recommend, because the commission is so low and also because they think most older people will not be able to handle the $2240 maximum yearly deductible, which is a non-issue for me.