1860s corset recommendations?

I am very new to US Civil War reenacting and I’m not ready to make the investment into a corset from Redthreaded or Period Corsets yet. Does anyone have any recommendations for Civil War-era corsets in the $100-$200 range? Or, does anyone have any tips for how to replicate the silhouette without using a period-accurate corset in the meantime until I can purchase one?