IKEA is great for larger canvas style works. I also really like Michaels - it has a mix of framed art works, frames (which are often on sale!), and other wall hangings. Also, budget stores like TJ MAXX, Home Goods, Marshalls (some of which you might need to jet down to Bellingham for).
We have a long empty hallway, so I used some Instagram photos that I took over the years in our town, had them printed and bought cheap frames on Amazon.