Mark, I understand there's a SiteOne on Walden, in Cheektowaga. Tractor supply may be an option too, one in Alden, one in Hamburg. I've also never seen a pre-em on the shelf nearby, but I haven't tried the places listed above. I think many of these product are 'for prefesional use only' due to New York laws. I have a real good garden center near me, (NorthRidge Nurseries in West Seneca) I was planning on giving them a call to talk it out. you may want to do the same.
Is this a decent pre-emergent?
Prepping for spring already.. 
https://www.amleo.com/dimension-25g-pre-emergent-herbicide-25lb-bag/p/ADMDG25/
I have a lawn that's just under 4k sq. feet so I could get 2 uses out of this. It's also the cheapest I've found online at $40. I have never used pre-emergent before (outside of the Scotts Crabgrass Control, garbage..) or even seen a pre emergent sold in stores in my area.
https://www.amleo.com/dimension-25g-pre-emergent-herbicide-25lb-bag/p/ADMDG25/
I have a lawn that's just under 4k sq. feet so I could get 2 uses out of this. It's also the cheapest I've found online at $40. I have never used pre-emergent before (outside of the Scotts Crabgrass Control, garbage..) or even seen a pre emergent sold in stores in my area.
