I think Paypal protection runs for 90 days, or is it 180? Worth checking as this may make a major difference.
If the item never turns up, and Paypal protection has run out of time, you recourse is to sue the company for your money if they fail to deliver what you bought. Of course if they go bust in the meantime, that’s worthless to you.
I’m sure they’d be delighted to refund your money and cancel the order rather than buying in more stock and selling it to you at a loss, in fact I’m surprised that’s not what they’ve done. If you want the discounted price and they’re prepared to honour it when new stock arrives, you’ve probably got little option but to wait.