What you need is a contract
DTG printer. There are several that post in the
DTG section of this forum; I'm sure some may offer to drop ship direct to your customer for an additional fee, but bear in mind, they're going to charge $5 to $7 per side for singles, so buy the time you add your profit, and the cost of the shirt, you're probably going to be pretty close to the $29 retail price you don't want to charge. Unfortunately, there's no inexpensive way to do small quantities and drop ship. That's why Cafe Express & Zazzle charge what they charge...it's not that they're making large profits, that's just what is costs (plus a resonable profit for them) to produce a good qualtity onesis, and the labor to package & drop ship.