Unless Myshop is easily available for you, I think even though your characters are in the 27-50 range, you should look to get higher leveled stuff from Gacha towns to keep for when you're a higher level. I'm suggesting this since your characters should level pretty quick at this level and it'd be better to prepare them for later.
I had 16 gachas(dunno where from) and I used 6 on normal drill and 10 on 2 gachas, result: the normal gave me 4 cash items(kinda junkish) and 2 rare items, but I recieved 5 rare really interesting items fit for my fox, any other comments?:P
(can the rare items get traded?)