Ok you had some places where you didn't reference the Calculations tab, and I had some places where I used colons instead of minus signs...
Try:
=SUM(MIN(CEILING(Purchase_Price,1000),Calculations!A30)*Calculations!B29,MAX(0,MIN(CEILING(Purchase_Price,1000)-Calculations!A30,(Calculations!A31-Calculations!A30)))*Calculations!B30,MAX(0,MIN(CEILING(Purchase_Price,1000)-Calculations!A31,(Calculations!A32-Calculations!A31)))*Calculations!B31,MAX(0,MIN(CEILING(Purchase_Price,1000)-Calculations!A32,(Calculations!A33-Calculations!A32)))*Calculations!B32,MAX(0,MIN(CEILING(Purchase_Price,1000)-Calculations!A33,(Calculations!A34-Calculations!A33)))*Calculations!B33,MAX(0,(CEILING(Purchase_Price,1000)-Calculations!A34))*Calculations!B34)/1000
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