Printful alternative

I'm currently using Printful as my print-on-demand source for clothing, connected to my Squarespace website. I'm relatively dissatisfied with Printful, primarily due to their lack of communication when products are out of stock, and small printing issues that I've found inadequate. 

Squarespace, I'm very happy with. But I would like to know if there's other print-on-demand options for me, that integrate with Squarespace. Printify looks great, and their selection of products is really nice as well. The issue is that you can't connect to Squarespace, as far as I can see, and I don't really want to spend time setting up all over again, with a new Shopify store. (Plus, they're more expensive than the $26/m option I have w/ Squarespace) What other options do I have/has anyone had a good experience with other options?

Thanks in advance.

Have you found a solution to this issue? I'm currently in the same predicament. 

I see products at Printify that I would love to add too.  I don't care for Printique's selection.  Printify has things that Printful (which I am using) doesn't offer.  I would love to be able to offer items from both but don't know if that is possible on squarespace.  And no way am I setting up another store somewhere else!

For me the issue is also that printful is really slow. I would love to offer my customers the option to ship them way faster their products.
Printify lets you choose suppliers in the country your customer lives in so the products are delivered faster.

I would love to see a API for Printify with Squarespace. Bringing together the best of both worlds. Please.