Here are some resources where you can place ads for adopting your pups out.
Guinea Pig Home - Home Index of / Petfinder.com: Adopt a pet and help an animal shelter rescue a puppy or kitten. Guinea Pig Rescue and Health Forum - Pigloo.net
You can also place adoption ads at guinealynx and on craigslist.
I'd also make sure that you charge at decent adoption fee to discourage reptile owners, make sure the homes they go to will provide C&C or C&C alternative cages and proper diet. I'd also encourage you to adopt in pairs if possible.
I don't know if you've sexed the pups yet but if you end up having 2 females and 2 males, re-home the females together and the males together. Remember baby boars need separated at 21 days, no sooner, no later.
Whatever you do, don't give them to the petstore.