I see. IMHO, spending a little more for case is worth the investment. However $7.90 to $9.90 is way above my threshold for Tempered Glass.
Average tempered glass in Taobao range from RMB 1.90 to RMB 30 depending on grade.
The above average grade Temper Glass usually range between RMB5 to RMB 15 and it usually loose pack. No intention to spend so much for box and packing. IMHO
I did compared to those 1-3 dollar range tempered glass.
However after combining the offers and deducting the vouchers the cost saving is not worth the effort.
So I try to adhere to same supplier and vendor to minimize unnecessary shipping cost. 
Like I shared, I paid only 9.49 dollar for the cover and screen protector inclusive the shipping.
So I think I get the best deal by getting the best combination I can at a reasonable price.
It is just to give me peace of mind. 
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