emblibrary.com is also my go-to site. They have a LOT of designs, frequent sales --every week, in fact, plus if you bought during the last month, even one design, you get a Happy Hour deal from Friday-Sun night which often includes things like 10 for $10.10 or half price on design packs, etc.
They also have a FB page, which will show you the new sales, plus when you sign in, you have a complete record of what you bought and you can redownload it at any time. if you start to buy something you already bought, it tells you, "You have already bought design nr. 0000 in order nr. 000232132
This board isn't as "free" as a FB group, and as such, there aren't as many replies. You have to be more patient here, but usually people reply--and often lots and lots of people reply.