Coolant Expansion Tank Cracked!

[Lookin4Trouble]

Ugh just my luck, took the X on a 600-mile round trip up to PA and back, and a week later the coolant expansion tank is cracked. Gonna mighty-putty it back together as a band-aid, but replacement part is ~$80 shipped from tischer. Any chance someone here has a good spare they'd let go for a bit less? the tank itself has a hairline crack all the way down the corner closest to the engine, everything else about it is just fine, but 'check coolant level' annoyance every day even topping it off finally pointed to the crack in the tank today since it's cold enough that the plastic shrunk enough to expose the crack. Entire engine bay is sprayed with dried coolant droplets =oP