Looking to add an additional phone, which will work? KX-TG944SK system.

I've just purchased a KX-TG944SK set consisting of the KX-TG970 base and four KX-TGFA97 handsets.  I was wondering if any of the older phone handsets might mate with this system?  Frankly, I don't want to spend the $50 or so that Pana wants for a single handset when I bought this entire system for $80.  My old system has the TGDA50 handset and I know they won't pair, but I was hoping there might be something that would.  Thanks in advance to anyone who can help, one way or another!
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