I keep getting timeout errors while trying to use the checkout feature to buy the new critical role book....not sure what that's about but considering my internet is fine for literally everything else, im fairly sure it is on DnDbeyond's end...

Yes, I can't checkout either.  Everything is fine up through viewing the cart, but trying to check out times out.

seems to be fixed now

Not for me.  Annoying.  I have a game in 3 minutes.

Made it to the address screen before it choked.

Made it to the credit card screen... holding my breath...  Nope.

There we go.  It worked.  Whew.  Better late than never.