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Backcountry [backcountry.com] has FSA V-Drive SB0 Seatposts (31.6mm diameter/400mm long) on sale now.

$5.95 standard shipping, free shipping over $69, 90 day risk-free returns, lowest price guarantee.

This is a well-built seatpost that can take some beating. A 31.6mm seatpost is widely used across modern mountain bikes, select gravel frames, and specific track or fixed-gear models like the Santa Cruz Tallboy, Trek trail bikes, and Cinelli track frames. Make sure your bike frame uses this diameter seatpost AND make sure 400mm is long enough for your fit factoring the minimum insertion point.