@FluffyCow Yeah, Rightstuf is where I typically go. The stuff on there is usually already discounted decently enough, then they have their yearly membership which takes a little bit more off, and I have no issue spending enough to get free shipping, though I'm sure my wallet hates me for it. It's the best site I know of as far as discounted new releases go.
The only real issue I have with them is it seems like the wait time ends up being quite a while for some things due to low stock, though that might just be me buying niche stuff. I'm still waiting on the first volume of Doughnuts Under a Crescent Moon and that released last month if I'm remembering correctly.
At any rate, it's a good place to shop if you want to save a bit, are buying enough to get free shipping, and don't mind occasionally long wait times. I just use Amazon for stuff I want to read immediately or when I want to pick up on one or two things since I have Prime shipping.
It is a bit heartbreaking how little I buy from my local bookstore though. I love going there, but yeah, their manga selection is extremely lacking.