I love the idea of a mixed pack 'garden to go'.
I was surprised, one year I had loads of celery seedlings and they didn't sell at all.
Basil is always a big seller, cilantro and parsely do well too but basil beats all.
Peppers, a very easy sell.
Next time I have too many celery, I might try slipping them into a mix.
Let us know how this works out for you.