It does make sense if one thinks outside of the box, @Marvomatic: if an identical item with identical terms is additionally for sale on multiple deal sites, and one can get exclusive discounts and/or cashback by purchasing through such deal sites (rather than directly through the source site), one can realize even more savings on the deal.
In this case, up to 12% cashback is currently available on Groupon purchases, with potential additional savings (for example, a pop-up window with a special 20% off offer appeared when I viewed the Costco membership offer page, but I didn’t test it in a shopping cart).
In cases where one has a special offer from a credit card, such as the 40% cashback offer from Chase and 30% cashback offer from Wells Fargo and US Bank on a Sam’s Club membership, then going directly to the source site to make the purchase would make the most sense.
plus:
Free STANDARD SHIPPING @$49
CATCH15OFF