Cheap to me = $50 a speaker.

Whats cheap to you?

Here are some midwoofers:

Madisound Store

Parts Express: Featured Categories

If you had a price range I could make some suggestions.

Parts-Express.com:Tang Band 25-1166SJ 1" Neodymium Tweeter | tweeter dome tweeter fabric dome neodynium tang band tb speakers

Parts-Express.comayton ND28F-6 1-1/8" Neodymium Dome Tweeter | tweeter nd28f-6 nd28f-4 soft dome tweeter dome tweeter neodymium dayton audio dayton loudspeaker daySpeakers123008

Tweeters will again depend on your price range.