TKS spares and repairs cost

Soon to pick up a 2008 SR22 w/ TKS.

Not had a plane with TKS before, how much might I expect to spend on spares and repairs for it over the next 5 years?

Do you have to get OEM original parts or are there alternative suppliers?

The OEM for the system is CAV, https://www.caviceprotection.com/, not Cirrus.

They offer repair and spares at very resonable rates. So far my total expense was a pump overhaul at 300 USD.

Bernd

Thanks Bernd