The Catalogue is divided according to the number of recorder involved; pitches of recorders may vary within the sub-categories; so one 2-part item may be for 2 trebles and another for descant & treble etc.
Clicking on the item title of most of these items will take yo to the website of Recorder Music Mail though some will take you to Hawthorn Press. There you will be able to buy online. Some of these prices may differ from those on the current list at the shop.