Sprint EVO 4G on Virgin Mobile Network???

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http://androidforums.com – PLEASE...I need help in the worst way. LOL I want to purchase Sprint EVO 4G phones for my two sons who are currently with Virgin Mobile. I love Virgin service and don't want to switch carriers but THEY really want these phones. The EVO's on the V-Mobile site are way too costly so I was trying to find a sweet deal on E-bay. I heard this was possible... Is it? Every time I call one of the neighborhood ABC Cellular shops they tell me Sprint & Verizon canNOT be unlocked; only ATT & T-Mobile can. Is this true??? If you currently have a Sprint android/smartphone on V-Mobile PLE (General)