Just got this alert from farecompare.com: MSP-BZE, $353 plus tax, $454 total. Dates are April - August.

$454
select MSP > BZE BZE > MSP Continental
10:08a dep MSP 3:25pm arr BZE (6h 17m)
4:05p dep BZE 11:53p arr MSP (6h 48m)
1800CheapSeats: $454 cheaptickets: $455 orbitz: $459 continental: $557 airfare: $595