SuperWalmart at 3250 Vineland Road (this is also know as 535) - much better traffic pattern - and you can hit on way from Airport if you are coming that way.
Store phone # 407-397-1125
From Disney -
follow signs to DDD, follow road around and turn onto hotel plaza boulevard, follow to stop light that when straight would take you into Croassroads plaza (goodings, tgifridays, etc), turn right at this light, follow this road under I-4 and keep going - I believe SWM is on right, but can't remember. It is about 8 miles from Fort Wilderness (but about 15 minutes with stop lights)