Totally. There are a million examples - 'marine' heat shrink electrical tubing at $2 per 6" length versus the same thing at Home Depot for $3 for three feet.
But my favorite is when West Marine sells things for more than the manufacturer sells the exact same thing on their own site. Or even better, when West Marine relabels the product under their own name and sells it for MORE. Here is a perfect example of the EXACT SAME lifejacket...
West Marine Type I Lifejacket = $109.99
Stearns "Merchant Mate II" Lifejacket = $91.99 (sold by West Marine)
It is the same lifejack, same pictures, same everything, all on West Marine's website.