Oh yeah you didn't know about that? Actually I think it's $3.88 for a 24 shot roll including tax (here California). We've had a few threads here about this, and it's controversial among the arty types that abound on RFF since many don't like Walmart. I learned about this from Super 8 Kodachrome users. Walmart will process movie film, even 16mm movie film it is said, and black and white, and medium format. I've only done Kodachrome so far, but with excellent results. It's all sent out to big labs and Walmart uses its purchasing clout to get it done and cheaply too. I've read that the Kodachrome and movie film goes to Rocky Mountain Labs.
To get Kodachrome processed at Walmart, put the film in the long term envelopes and check the special instructions check box. Then, in the special instructions text box write: "Color slides process K14 - process and mount". It comes back in 10-14 days mounted in old-school Kodak like slide mounts -- I love it! May be this will wean you off digital 🙂