I did the same thing, got a replacement off ebay... the install isnt too bad... you just have to be SUPER SLOW when you take off the original screen from the navigation buttons (the buttons are like a sheet of wire which has been glued to the screen, removing is slow)
To be honest, i have replaced my screen a total of 3 times... The first time the screen replacement had a pink hue to it... I emailed the seller and he shipped a replacement which was fine... then i dropped the phone again and that stopped working, so i got a third which has been fine for the past 3-4 months.... well i guess it has been four times cause i replaced the second screen with the pink screen so i could have a working phone... then replaced the pink screen with the final good screen again.
but yes. the replacement screens on ebay are pretty cheap... a word of warning though, they are NOT gorilla glass, so no protection against scratches. and i am not sure if they are SAMOLED screens or not. they might be just lcd?