ISO Octonauts toys

Hello!

My son (3 years old) is absolutely obsessed with Octonauts… we’ve watched it probably everyday for at least the last 2 years, if not longer since his older sister (5 y/o) was also a big fan.

I’m wondering if any of you have good leads on where to buy Octonauts toys that don’t cost an arm and a leg? My son only wants Octonauts toys for Christmas and we’ve bought a few off eBay but definitely wanting to get him a few more. Is there anywhere better to look or is eBay pretty much it?

Thanks in advance for any help!