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Not sure if you have Castrol Edge 5w-30 available but they make an A3/B4. One of the requirements there is an HTHS of 3.5 or greater. Should be cheaper than the Redline or 300V, though I'd expect to change it more often as it will likely shear down faster.
https://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/6E381DAAE02AB64780257D540060FBE8/$File/BPXE-9P9HK3.pdf
They don't list the HTHS specifically, but from what I've seen on BITOG it's 3.5. And given the viscosity at 100*C that seems plausible (It's nearly a 40w).
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