Wondering if Premiere will work or if Enterprise is necessary? Inventory and remote access questions too.

I have a client that would really like to switch to QuickBooks.  Time and budget are both very tight.  

Inventory is their biggest issue - it runs around a million dollars and maybe 3-5,000 items.  That counts some items as two that would really be the same item at two locations.  It's probably not feasibly to get all of the inventory items into an inventory system at least for a while.  However, the big ticket items could be.

We'd like to be able to have sales invoices and receipts entered on the computer at the time of sale and be able to track at least the most significant inventory items.  There are two sales locations about 40 miles apart.

Do we need to go to Enterprise?  It would be a hardship right now to find that much cash - the necessary 3 licenses for Premiere would be difficult enough.  

What are the practical options for that 2nd store?  They need to be able to see inventory and to prepare invoices and sales receipts.  It might be nice to be able to access the whole program but perhaps not vital if it would save money.

Any advice about how to get them started with a viable system as inexpensively as possible would be appreciated!  Thanks.