I would usually just throw in an etc. after the list to indicate that I could say more, but it would be pointless additional detail. After that you can add whatever punctuation seems appropriate.
Lawn mowers, pruners, garden trowels, watering canes, etc. -- you'll find these and many more tools in our gardening equipment shop.
I prefer the em dash, since the list sounds like a nonrestrictive clause, even if technically it can't be, because you don't have a first part to the sentence, and because you reference the list in the second part. But it's the same kind of thought pattern, as a "side list" of examples.
Just as an example, this would be a nonrestrictive clause:
If you're looking for gardening tools -- lawn mowers, pruners, etc. -- you'll find them in our garden equipment bay.