(Portland, OR)  --  Portland police say two thieves have been arrested, thanks to a tip about a stolen credit card.  Authorities say 39-year-old transient Paul Roys and 18-year-old Brooke Bearman of Gresham reportedly used the stolen card at a Walmart in Wood Village after it and other items were taken from an apartment in Beaverton Wednesday morning.  Investigators say the suspects were still at the Walmart when they were taken into custody.  Police say Bearman and Roys had committed other burglaries in Beaverton and Gresham by targeting retirement communities.