i picked up an olympic bar with a pair each of 45's, 35's, 25's, 10's, 5's and 2.5's on sale for $100 at Dick's Sporting goods. The bar isnt the greatest (the chrome is constantly flaking all over the place) but it would still be a decent upgrade.
that was 2 years ago but i'm sure they still have those sales. the price might be a bit higher now though.

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