A lot of it depends on what sizes of pieces you want. I like working with scraps/collections of fabrics so smaller pieces are fine for me. I'd check out some of the stash bundles from eQuilter.
https://www.equilter.com/category/38...se-scrap-packs
You can also look at some of the fabric swaps we have going on here. Back around Y2K I did a lot of fabric swapping, unfortunately for me I'm still in the fabric using phase of those swaps! Or, there are commercial clubs you can join that will send you a package of assorted fabrics (usually fat quarters) at intervals.
edit: I should mention that I have bought two of the scrap packs when I was still buying fabric. They were both great, particularly the black & white collection, was very happy with the size of the pieces and the quality of the fabric. I do most of my on-line fabric buying at equilter first and amazon (various sellers) second. In the real world, I do most of my fabric buying at thrift stores and my stash. Don't always come home with stuff but sometimes I score big!