Lyn was right, there are 404,000 results if you Google on your own query text "tool for tightening nylon zip ties", the results also include places to buy them.
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“Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
Unless you're tightening a lot of the nylon ties, you can use a large pair of needle nose pliers and save yourself some money. I've done that myself many times over the years.
If you're really hell bent on buying the tool, you can find them at Wally World, Lowes, HD, Sears, and just about any electrical supply store. Even Ebay lists them!
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"Veni, Vidi, Vici"; hendiatris attributed to Gaius Julius Caesar, 47 B.C.
i use alot of zip ties. they have hundreds of uses, but there are times when i need the tie as tight as possible. i even use them instead of hose clamps depending on the pressure.
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