I don't have a link - but the pool stuff is usually between the lawn and garden section, and the childrens toys. Look for the HTH brand 5 way kit (about $10-14) to get you started.

However - I strongly recommend Ben's new kits avaliable on the pool soutions pages. I have a kit that I bought last year - and it's very handy - much better than the el-cheap-o HTH kit from the mart.