I'd personally call the store if it claims to have any units in stock online to save u the drive since their online inventory can usually always be inaccurate due to a few different factors. From in-store the employee can give you a better estimate of inventory thru Lowe's internal network of other Lowe's in the area but again call yourself to confirm etc. Claiming your misinformed by a store employee will bot only waste your time but get you nowhere to solve your issue.
Check clearance if they aren't on the main shelves. Download the Lowes app, find specific item you're searching for, then "Check Store Map" to find the actual instore location of the item prior to ever arriving.
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