Etsy is a great place to buy prints big and small. There's a whole world of amazingly talented artists and illustrators with Easy shops, just waiting for you to fall in love with their style. Plus they often offer a heap of options - from large originals to A4 prints to art cards - so you can normally find the right sized print to fit both your wall space and your budget.
Right now I'm sitting next to a pile of prints that I've been meaning to get framed for months, and I'm wondering where on earth I'll find the wall space to hang them, so yeah, I'm on a print buying ban. But I can still look, right?