For your own sanity, I recommend you check local shelters. I had terrible
experiences with petfinder when I was looking. I applied at about a
half-dozen "rescuers" and (maybe this is just a New York City thing but) I
was subjected to the most stringent and inconvenient requirements even to
visit with a pet.

One person had an 8-page application I needed to fill out that included three
personal references, a landlord reference and a veterinarian reference. All
three of the personal references were called and asked very personal and
embarrassing questions (for the respondent) to answer.

Often the fees are outrageous and the individuals who I met with were,
without exception, overly protective of their pets. It's no wonder there are
so many out there waiting to be adopted. I spent six months trying for a cat.
I finally went to Bide-A-Wee, which, lucky for me, is six blocks from here.
(I don't know why I didn't go there first.) And within 20 minutes I had been
selected by one of the best cats in the world. Within an hour he was home.

Obviously, if you have no other alternative for adoption, use the individuals
on petfinder, but if you have a choice, use the established agencies. At
least, that is my recommendation, based on my experience.

Unless you're prepared to provide a home for all the kittens for the
rest of their natural  lives--and there could be 6, or 8 of them--then
it's not a wise thing to deliberately breed a mixed-breed cat.

I think you would be much better off adopting or fostering a pregnant
female from the shelter--you can enjoy the baby kittens and the shelter
will then help homes be found for them.  You're also not adding to the
population problem as the foster cat would not have been deliberately
bred, she would have an unwanted pregnancy.

--Fil