@Stephen Chittenden
Thanks! I'll add that vendor to my list. I agree with you and use mine right away. I'm sure they are verified when purchased (listed) by the vendor and waiting just opens the opportunity for fraud. What I do, generally, is go online and fill my shopping cart. I then go to cardpool and purchase the cards necessary and go back and complete my purchase using the cards. I don't allow any gap. If the card is bad you know prior to the retail purchase going through and can contact your card vendor within 30 minutes. I doubt I (would almost certainly never) would wait the 90 or so days to use a card.
On another discount area, I discovered that I (you too) can get "builder" prices through online sites such as Builder.com, lightingDirect, Faucets.com, Fastfloors, etc.. The savings are substantial on these sites (from 10-18% percent off their regular online pricing). You can also get 23% off Wayfair - I used this site for some vanities, mirrors and furniture for my pers. residence. You need to sign-up for the Builder Program but I just told them about my properties, remodels, flips and was "in". Many here most likely already take advantage of discounts through various sources - but I'm a "little person" and was only clued-in a few years ago.