I’m not sure if this is the same Woodchuck’s as on Amazon, and my order hasn’t arrived (or even shipped) yet, but Woodchuck’s Wood is having a pretty good sale on small, thin boards. A 6 x 24" piece of 1/8 walnut, for comparison, is $3.50 right now as opposed to ~$9 for the same size board at Green Valley (who has some of the best prices). You have to factor in shipping, but I thought it was reasonable enough with the sale prices. And they have thin boards up to 9" wide (I bought a bunch of 9x16" boards). The sale includes walnut, red oak, hard maple, cedar, and knotty pine from what I saw.
Happy to report back on quality once it all arrives.