I think the site is pretty awesome but I had the same exact feeling about the price. If you're interested, I don't mind helping out with that.

We have an API that you can use to maximize profit over time. You send us order information, we build a pricing model, then you make calls out to the model to either update it with a new order or get a price.

For more info (we actually use tshirts as an example): https://ventata.com/Ecommerce/Home && https://github.com/Ventata/API

Send me an email and I'll give you an API key.

(Don't go through my normal site, you'll have to pay that way)