If your domain registrar lets you "forward" a domain to another URL, that's probably fine ..... IF you're okay with letting the sale of that specialty product be actually sold/shown on the real store's own domain.
eg: the "myFancyItem.com" points to the "myStore.com/url-to-product-page", and customers never actually land on "myFancyItem.com" .... their shopping and sale and branding and experience are all on "myStore.com" ... and could be upsold or will see other products on myStore
ie: "myFancyItem.com" would essentially act as a "URL Shortener" for quick access to the specific product on "myStore.com"
Point: if it's always shown and sold on "myStore.com", regardless how the visitor "got to" the page (through any forwards or url-shorteners or fancy-stuff), then you aren't likely to have any issues
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