Where Do I Find New Screen Spline?

A home owner from Toms River N.J. says:
Ok I purchased my home it had a screened porch, now I need to replace my screens I've done it a couple of times, but the spline is a hard plastic spline. I've had to hammer the spline into the grove of the panel. No problem with that . But this is the problem I can not find new spline. Ware do I purchased this type of spline from? I've looked in my home improvement stores but no luck. Any suggestions or places to find this plastic spline from?
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Tom from SWISCO responded:

We only sell one type of hard plastic spline, which is our 55-109. Would this be what you're looking for? Review its size and see what you think.

Alternate image for 55-109
Alternate image for 55-109

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