There is a Walmart Super Center on the 535. From OKW you go over towards DTD and on Hotel Blvd you turn left then right on the 535 and it's just a few minutes drive from there.
There's a Wal-Mart Supercenter at 3250 Apopka-Vineland Road (aka SR 535). To get there you:
Turn right out of OKW onto Vacation Club Way
Turn right onto Buena Vista Dr
Turn left onto Hotel Plaza Blvd
Turn right onto Apopka-Vineland/SR 535 (this is a T intersection)
It's 5 miles.
If you continue south on SR535, there's also a Publix with a liquor store, and if you turn left onto 192/Irlo Bronson there's a Super Target. There's about 1 mile between Wal-Mart and Target, with Publix in between.