German emigrant Albert Mueller opening his first store here in Oacoma way back in 1919, relocating to the current site in the early 1950s. At this time it was a ten stool lunch counter and small grocery store; today it is a major business consisting of a restaurant, saloon, supermarket, gift store, clothing outlet, inn and campground. While still a family business, Al's Oasis is very much geared towards Interstate traffic and bus tour groups rather than local folk.
If you go:
Like Wall Drug, its more famous counterpart 150 miles west along I-90, Al's Oasis still offers a cup of coffee for just 5 cents.
Links:

1000 East South Dakota Hwy 16
Oacoma, South Dakota 57365 USA
Phone Numbers:
+1 (605) 234-6051
Oasis Inn
+1 (605) 734-6061
+1 (605) 734-6061