Department Store Coming from BGI

Hello - could someone recommend a large "Walmart-type" department store that we can stop at with our rental car after flying into BGI?  A store very close and convenient to the highway, hopefully.  We will be driving to Speightstown, so the store could be along Highway 2A, or Highway R to H5 to 2A, or Highway H5 to H4 to 2A.  Our top needs are beach chairs and a beach umbrella, so in the U.S. we think "Walmart" for that type of thing - but of course it could be very different in Barbados.  Thank you very much for any suggestion(s).

Cost-U-Less is a big store along the ABC highway. You could take the ABC hwy up to Welches, St. Tomas, just up the hill from Warrens on the ABC hwy. There are other big box stores, but that one is convenient going to Holetown or Speightstown.

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