How much does it cost to replace a grey water tank for the shower in a 33 ft motorhome?

I can get a great deal on a 33 ft itasca motorhome but it needs the grey water tank for the shower and sink replaced.The guy said 100-200 dollars but he's not positive.Has anyone had to replace one and how much did it cost?How much does it cost to replace a grey water tank for the shower in a 33 ft motorhome?450.00 parts and labor. Parts 300.00 from Workhorse, labor is 2.5 hours in Spader's RV labor guide.How much does it cost to replace a grey water tank for the shower in a 33 ft motorhome?The tank itself should run about $300. Installation about $150 is it is single skin underneath. Dounle the installation if double skinned. Ad maybe an additional $30 for miscellaneous plumbing parts.