The RE92 tires are available at Tire Rack, about $79 each.
As for battery issues: get busy on InsightCentral.com and find the recipes for grid chargers.
Look for the thread under Gen 1, Modifications and Technical Issues.
I think it's a sticky there.
Many batteries have been brought back from near-death by good use of a charger and discharger.
I haven't seen any new replacement IMA batteries for anything like $500. More like $2000. Used or refurbished ones will likely soon have the same issues as your ailing one. The remedy in any case, is occasional and appropriate use of a grid charger, and sometimes a discharger is needed. If they were built into the car - and if owners were told to use them 2-3 times yearly - hybrid batteries would last several times longer than they do.
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