This preprint looks interesting for those who are looking for HPLC purification options:
3D printed connectors to join the column to a standard HPLC system and low cost material.
It also led me to this paper on using aerogels for protein separation which is also very cool although less commercially available so you’d have to make friends with some chemists!
Shapeable, Underwater Superelastic, and Highly Phosphorylated Nanofibrous Aerogels for Large-Capacity and High-Throughput Protein Separation
(no open access version unfortunately)