I am so lucky to live so near this car-trouble-solution store! I could literally walk if necessary, but so far I've just had to visit for routine maintenance stuff.
Large bottles of oil and filters are available here to purchase to DIY your oil changes, along with air filters, lights, and a bunch of other parts I don't feel safe replacing on my own.
Store is really good about having directories stationed throughout so that you can look up your car's make/model to ensure you're getting the right part, and they'll even double-check your work for you using their computer database before you walk out the door.