Depends on how well you walk. It's not a fun walk, but Costco is about a mile from Wellington, out the drive to Revere Beach Parkway, across the Malden River, then into the shopping center. There is a bus there from Wellington (I don't know its schedule, I just see it there - just checked, it's #97), but it's probably faster to walk unless your timing is really lucky.
(At least that's what I find in general, living in the middle of Somerville, a mile and a bit from Davis - definitely faster on average to walk to Davis than to fiddle with buses!)
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(At least that's what I find in general, living in the middle of Somerville, a mile and a bit from Davis - definitely faster on average to walk to Davis than to fiddle with buses!)