This site lets you compare plans based on where you live.
https://rates.medicarecompared.com/ms/?customer_id=303-229-9197&utm_campaign=e-search_b-mc_l-tier%202_p-ms_d-uk_t-none_bs-tcpa_h-bh&utm_source=bing&utm_medium=search&utm_content=&utm_term=medigap&adgroupid=pd-medigap_mt-e%3Ap&extensionid=&location=102990&adposition=&device=c&matchtype=p&campaignID=638619216&adid=&querystring=cheapest%20medigap%20plans&network=o&adgroup_ID=1250146056034727&msclkid=6e2544c4bd521b97ec84239d1719fb83
The worry I have with Advantage is that they can drop your in-network doctors and force you to change to doctors in their network anytime the want to. Some insurers, like United Healthcare, also have very high rates of denying medical treatment. They can also just choose to cease providing any coverage for your area, which has been happening more in rural and low population areas.
With original Medicare, youre guaranteed medical care. So you might consider your health and decide whether you even need a Medigap policy if the copays would be less than the premium. Theres a big risk, though, because if you get seriously ill, you might be on the hook for thousands of dollars.
Heres an article on help for seniors in affording supplemental insurance.
https://www.seniorcorps.org/medicare/what-if-i-cant-afford-premiums-on-medicare-supplemental-insurance/