For many of the hardcore DIYers of the world, Harbor Freight Tools has become a choice point of purchase for most home improvement needs. That’s because the family-owned discount hardware store chain has long focused its energy on providing quality tools and gear to the consumer masses at prices that shouldn’t leave your wallet hurting too much.

While shoppers can typically enjoy a little budget-friendly DIY shopping through Harbor Freight’s online outlet or at the company’s many brick-and-mortar stores, some still try to seek out even better deals through other points of purchase. While sites like Ebay are no doubt hubs for scoring a deal on Harbor Freight gear, there are reasons to be wary of purchasing tools from sites not specifically operated by the company itself. More specifically, some fans of the company think that you might be better off if you choose not to buy products from Facebook Marketplace.

That marketplace has, of course, become a legit haven for deal-seeking consumers, with sellers on the site offering discounts on — well — pretty much any product you can think of. That list indeed includes any number of tools and accessories from brands currently owned by Harbor Freight Tools. Tempting as those prices may be, there are a couple of good reasons you should still be wary of chasing such deals.

Yes, some of the deals shoppers are seeing on Facebook Marketplace about Harbor Freight products may actually be too good to be true. The Marketplace is, after all, not an official Harbor Freight outlet. Since transactions are occurring with third-party sellers, you can bet that any sort of warranty from Harbor Freight that may have once covered manufacturer’s defects has been voided — as is the case with third-party sellers on Amazon.

There are other potential issues you might face purchasing tools from a Facebook Marketplace seller. For one, a seller might be misrepresenting the tool they are selling. For instance, a used tool may be listed as new, or its description might not be accurate. Some sellers may even attempt to secure these sales by using the “sold as-is” label in its description. There’s also the “flipper” conundrum to consider. Some Harbor Freight shoppers reportedly buy out stock at discount prices secured through Harbor Freight’s Inside Track membership program, before selling them in third-party outlets at a premium price.

Facebook Marketplace does offer purchase protections for transactions that are processed directly through Facebook. Those protections are, however, voided if you make a local pickup or cash payment deal. Ditto if you use third-party payment options like Venmo. All in all, it is at least worth exercising caution when shopping on Facebook Marketplace for Harbor Freight tools.