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Use Ortho Groundclear concentrate and a hose-mounted insecticide sprayer like this:
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(I use an older ACE one that isn't dial adjustable. You want basically the 'strongest' mix you can find)
Spray every portion of your yard you don't want weeds. For about 9 months, you won't have weeds. When you start to see some again... spray the whole yard again.
The Groundclear really doesn't work on stuff that's already growing. Use Roundup for that. But it will keep stuff from growing, and it's available at ACE, Home Depot, Lowes, etc, unlike some of the other pre-emergents where you really need a bug & weed mart type of place.
I have a burner, but that just is for getting rid of stuff that you've already killed with Roundup. The Groundclear will keep you from having to do it in the first place.
ETA: Product data not loading but the links are working.