Amazon has the BlenderBottle Classic Loop Top Shaker Bottle for only $6.90 and free shipping for Prime Members when ordering it as an Add-On Item. It features a 28-ounce capacity and 316 stainless steel BlenderBall plus a loop top and tapered spout.
If you are not already a Prime Member you can join with a 30-day free trial of Prime, as a student with Prime Student, or as part of Amazon Family.
Please note that Amazon prices are subject to change at any time and may have increased or decreased since this offer was posted.