Once, I found the 50,000 offer by using Google. This was a couple of years ago, but may work at some point again. At the time, the offer on the regular webpage was for 25 or 30,000.
A good tip I got here on DIS, was for me and my husband to each get our own cards. A few years later, we each got the preferred card (closed the basic cards, I know, "bad" but we have many other cards, for decades, with high credit limits). So 200,000 points in total. MIGHT switch back to the basic card in a few years, trying again for even more points. We did have to spend a certain amount, so we staggered the applications and used the $$ on things like tuition, life insurance, DVC dues, etc, stuff we were spending $ on anyway.