Shopify POS for Mac

One of my deciding factors for using Shopify was the promised integration with Checkout POS App. I've now given up on that dream and I'm looking for an alternative solution. Has anyone used an app that will allow quick and easy order entry into the Shopify back office? We use Checkout on Macs and it's really good for quickly entering telephone orders, which are about half of our business. Recently Checkout has been causing a few problems, support is non-existant and we have to keep two inventories and accounts.

I have trawled the Shopify app store and Shopify POS looks like it would fit the bill apart from the high monthly cost and having to use iPads which would be totally impractical for our purposes. If anyone has any ideas, or has set up a similar system I would be very grateful for some suggestions. . thanks

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