When I try to go to: https://www.dndbeyond.com/pricing-details I keep getting a 403 forbidden. Maybe I tried at a bad time but I thought I'd let y'all know

I get a 403 error, too, but I don't know how or why you are trying to get to that page?

Are you looking for the marketplace?

I was trying to look at the pricing details for a friend, the link has been provided by staff in many posts so it should work or redirect regardless.

Yea, it's odd that it isn't resolving for you.  I would certainly direct to https://www.dndbeyond.com/marketplace though.

I can surely mention that the old links are causing issues.  Thanks for catching this!