To reiterate what everyone else has said already: insurance would be your best option if you aren't particularly skilled at dismantling small electronic devices. If you don't have insurance you could call in and add it without telling anyone the phone is already broken, assuming it still makes and takes calls...then use it for the intro period so they can see a call history on the device (not sure on Sprint, but it's usually about a week or so last I checked), then make a claim when able to. The insurance deductible cost is better than buying a new $500 phone outright...though often times you do get remanufactured phones via insurance claims. Remember to get a rubber or hard plastic case to protect your next one...totally worth the $15 or so.
Call around also and get repair quotes, there are many locally owned cell places who will repair such things. We have Spokane Wireless here in my city. Personally I buy new parts online for cheap and fix things myself...I've done so with tons of phones, iPods, etc. If you should so choose to brave the endeavor of repair then I recommend eBay; it's where I myself have had the best luck finding cheap parts. I just looked and its about $50-80 for a new LCD and touch digitizer for your phone on eBay -- there are a ton of auctions, just make sure it's OEM and not from a seller in Hong Kong and you're golden, lol
Oh and often times you can find tutorials on how to take apart phones, iPods, etc. on YouTube. Again, I checked and there are a ton of them for the EVO. There are options for you for sure -- no matter what you choose to do, good luck Bob!
-MeowMix