Hey, I'm looking for a big vinyl for guest book.

I would try sunrise or HVM if they are still around. if youre downtown toronto theres a record shop on queen east of spadina

They are available on Etsy.ca. under vinyl record guest book or amazon.ca if your a member to get 2 day shipping. Getting your names personalized and date. I would have suggested the record stores though they are not made to be signed on.

I would either buy a new record at a record store, one place I know that sells them is called Sunrise. Or you could buy a thrift store, if you do that I would do a bit of research to make sure you are not buying and writing on a collectible record.

Record stores would be your best bet.
You might find some at a thrift store if you don't care what album it is. If you do any record you could put something personal in the spot in the centre where the album info is.

There's a few record stores in Toronto. The most well known one that I've been to is Sonic Boom on Spadina. They have a huge selection so you could choose one that both you and your FH like so it's not just any record. And you can always buy more than one of you need more space.