Despite no longer having a "bricks and mortar" quilt shop, I couldn't resist selling the "Easy Angler 2". I have one on my machine and just love it! I'm finding that it reduces my piecing time significantly.
It's a clear piece of rigid plastic that you attach to the bed of your sewing machine. It eliminates the need to draw lines on the back of squares when you're making half square triangles and flying geese. It will also improve your quarter inch seam accuracy and makes mitre-ing seams easier too.
It retails for AU$11.90 + postage. You can order by email to email@example.com or phone on 0437 200 888