Needing help finding a toddler mattress for a co-sleeper who has slept on memory foam.

Amber

I’ve co-slept with my daughter all her life and now we’re looking at getting her own bed, the only problem is that I’m worried she won’t like the bed if the mattress is too hard. Can anybody recommend a mattress on a budget? Or maybe even tell me I’m being silly and should just get the 36 dollar best seller on Walmart.com