Home Depot has their own brand they sell under the HDX label.
Ortho also has the same chemical/salt marketed under the name “Ground Clear” formerly “Triox”.
Same chemical, higher percentage, lower price. You are not paying for the advertising budget for “Roundup”. Similar to buying Scotts fertilizer.
I have found the HDX brand too, and like it for the higher percentage active ingredient. Last fall I got it at a clearance price and stocked up.