You've mixed up the A and G gates.

3 is connected to G, and I think the only clubs you can buy your way into in either are the UA lounges. The UA F lounge is a very nice space (probably their nicest lounge in the USA) and has a decent array of food and drink, but you can't buy your way in (without an int'l F ticket). The SQ lounge (haven't been there in years) is a small space, but has decent food/beverage. Again, you can't buy your way in, nor can you buy your way into any other 3/Int'l G lounges.

1 doesn't have much. DL has a landside Skyclub which is so so (haven't been inside in years), and AS has a Board Room in the B/C pier of T-1, which will be closing this summer. It is a small space. I don't think there are any other T-1 lounges left. Until the great T-1 (B/C piers) demolition and BR closure, the BR is good for flying WN and AS.