I have some mixed feelings here. Having a business like this with so many products can be pretty difficult. The manufacturer's and suppliers don't tell the retailers when something will be discontinued until you try to order it. This isn't always the case , but many times it is.
I just ran into this w/ montana Black Gold. The trap door is no longer made, but it was listed in 2 of the 3 supplier catalogs I recieve.

I think they tried to make it right with you. I did not see if they charged you for the second set of peeps?
I'm not so sure they didn't have a typo , I can't find a 9/32 peep listed anywhere.