Looks like your question got answered here. I think they would just tell you to go to garden centers/nurseries until you find one of their seed stands.

A pre-emergent weed control product needs to be in contact with the sprouting weed seeds - wherever they are. If you have weeds sprouting in a mulched bed, it's probably because they blew in or birds pooped them into the mulched area, and they are growing above the landscape fabric. You might do better to just hand-pull the few that sprout instead of using a pre-emergent. Pre-emergents are best in areas where you have a lot of dirt and a heavy weed crop you want to prevent. After a couple of years, if they are successful, you can switch to post-emergent killing with herbicides or hand pulling.

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