I buy cast vinyl at $260CA for a 24" x 50 yard roll. That's a shit ton of decals... but there is work involved and application tape....
Our minimum charge for any job is $50. Not worth the paper work otherwise.
Batch is def the way to go imo... 1-offs are a PITA and expensive
It depends what 10tonvinyl's market is and what risk he's willing to take in being left with 100's of stickers... oh and posting that shit all over the place one at a time... oh and processing the transactions etc etc