where can you buy the original yu-gi-oh! cards?(it's okay if its the yu gi oh gx cards because they have some of the original cards too like exodia the forbidden one)

Like the ones with Blue-eyes white dragon???

God i used to play with those all the time.

I'd check second hand stores, thrift shops, comic book stores, ect
if not try ebay or amazon.

i have some old ones i can see what ther are a mabey soud how i can give them to you if you like