probably cheapest and easiest option is to order REPLICA tags with the same numbers as her original , RED pairs replacement tags are often as FOOBAR says sold in strips ,depends on the manufacturer , I bought 5pairs from SHEARWELL . REMEMBER you need tagging pliers ,so if you or someone you know has some then this will dictate who you buy the tags from . You cannot ask the person who supplied the lambs for a pair of tags as they need to have a record of what ear tags they replaced, and this lamb has already been sold,so not theirs to replace , and you have to have a record from the supplier of tags purchased