They do not seem to grant CLIs on Amazon for more than 1,000-1,500 at a time. I do have a card with them too, although not listed in my signature, its buried somewhere, have had it for 5 years with a $2500 CL. I would wait six months though before asking again. They do not seem to grant CLIs back to back until 6 months has passed IMO, but as always YMMV.
Congrats on the increase! My 600 limit on the amazon card is more than enough for me right now. The walmart 600 though is another story. I have only had the card a month and I use it pretty heavy. That's where I grocery shop each week and I know I will be there more when Christmas rolls around. I'm tempted to ask for an increase after I pif tomorrow but I saw where everyone says to wait 4 months. I was just approved for sams discover for 1800 so I wonder if ge would give me a bump on this one???
You can use your Sam's club Discover at Walmart tho!! That's what I'd do if I used it a lot. $600 is kinda low if you shop weekly there.