IKEA is a huge warehouse-like store specializing in selling ready-to-assemble furniture.
You can have the furniture shipped to your home (so you don't crowd your fellow passengers).
Shipping very large and heavy items could be expensive.
You may already have an IKEA in your country, so you may want to visit another place unique to St Louis.
The IKEA app does not have store map for St Louis. (The store is specifically designed to make you walk through the whole store to force you to see all their merchandise.)
From the website below, "The IKEA store layout is intentionally designed to be confusing to zap shopper willpower and make you more likely to succumb to impulse purchases. So, remember that before you throw that LATTJO Brain Hat or that GULLHOLMEN banana fiber rocking chair into your cart."