what's the difference between this and these ones? they look like the same toy, the description and photos are the same, but the prices are different.
http://www.dinodirect.com/fire-truck-robot-toy-transformers3-series.html (SKU: A0141000UQ)
http://www.dinodirect.com/action-figures-sentinel-prime-transformers.html (SKU: A107100GDQ)
http://www.dinodirect.com/transformers-sentinel-prime-action-figures-weapons-shaft-move.html (SKU: A3076000DR)
I would suggest you to read the reviews of each (if available). Sometimes looking like same does not mean they are same product. I am not trying to say that those are different. But, please bear in mind that these are non-OEM products. So, may be three companies made them. Or may be the durability/material are different.
One issue is that, the three products you mentioned are from three different suppliers. Here, the supplier price is displayed. Price can sometimes vary from supplier to supplier. One product has an image of box. You can contact each supplier by clicking on supplier name. you can further inquire about quality and whether it will come with box etc.