anyone have any experience with these companies?

[blazeonchevy]

cardomain.com or millionbuy.com?? i put the same items in both and millionbuy.com is about 25$ cheaper (3 items free shipping) but cardomain i put the same 3 items in the cart and i got 3 other things free and free shippiing on the 3free things(i put in two sets of speakers and a hu, and got an install kit, wiring harness and molding piece free.total shipping on cardomain 8$. ... so as mentioned before.. the total after shipping was included was about 25$ difference. but im not sure if i can trust this other company.. so anyone with experience with either of these companies. please speak up as im not sure what to do and i want to order this tonight... thanks -sam-