Tiresavings has a few MXV4 varieties. I am not sure which model is runflat. I came close to buying Champiro tires from them since they are one of the few stores that carry them. Eventually I just bought some Kumhos from TireRack, so I can't comment on Tiresavings' performance as a vendor.
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-Rob Riccardelli
80GB 16MB MK2 090000736