Thought I'd share my good find with anyone else who's looking for a similar sized hide...

Our 450g BP has outgrown bowl #2 as listed in this wonderful thread here, and today I found a good upgrade at the dollar store. It's actually a tortilla holder, and a bigger version of bowl #1 in the thread. Currently it looks very roomy in there, so there's plenty of growing room. It takes up most of the 10" width of the tank.

Here's a picture of the prior 2 hides plus the new one (hard to believe that first one used to have a lot of room to spare!):


Checking out how smoothly I cut the doorway: (Ignore that Petco dial, we use AccuRite but the dial won't come off.)