Compare bottle sizes and packaging options
Verify the volume and the kind of package attached to the selected variant.
Use the selected size in the comparison
The Happy Gee listing identifies 15 mL, and Sensuva lists 50 mL for its bottle. Compare both values in milliliters if you are comparing cost by volume. Confirm the number on the label when the product title or URL gives a different impression.
Check what boxed or bulk means
Spot-On offers both descriptions at the same listed volume. If you want the retail packaging and its printed instructions, verify the boxed SKU or ask whether the bulk version includes an insert.