China warehouse stock becoming available tends to shift prices across the market for a bit. If the May pricing is updated and the pre-order locks in before any adjustments, that can be a reasonable window. Worth comparing against what community members have actually paid in recent orders - listed prices and confirmed transaction prices often differ, especially during a warehouse transition period. The RT concentrations matter for dosing precision so check which formulation you need before committing to a price point. For first orders, the vendor thread is the right place to validate before pulling the trigger on a pre-order during an opening window.