I will ante in as someone who has owned multiple egg eaters.
Yes, you absolutely can co-hab them. Just make sure there are lots of hides so each of them can find a place to call their own and you also want to keep an eye on them just to make sure one is not hogging all the food. My only caution would be that they breed really easy so you should be ready for babies if you co-hab which means either having ready access to finch eggs or being prepared to syringe feed.
As has been noted, you can pick up quail eggs from just about any international supermarket. One pack of 18 should be more than enough to get you through the year.
Other things I will add here:
-These animals are very fragile. I do not recommend handling them as it is all too easy to accidentally break/kink their spines
-Give them vertical space. They are best treated as semi-/fully arboreal. They climb. A LOT. I have outfit my cage with numerous finch nests because those are the preferred hides
-They need to be feed seasonally and sparingly. This should be a no-brainer - birds only breed during a very short period of the year so their food source is only available for a couple of months. If you are feeding weekly they will get obese
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