Spare bases are available reasonably cheaply direct from the mfr from here:
I got sick of constantly changing my broken strainers too. Mine finally died when the white pump casing also cracked. The new version of the pump (edit oops I may be thinking of the Rule Mate
version here) - the 1100A
- seems to be much better designed and made out of less brittle plastics - although time will tell ...
I've also had a good response from ITT in the past complaining about a pump failure, so they are reasonable to deal with.